PickSmartly Review

Best Gold Short Drill Bits in 2026

9.8 PM Score
Products Evaluated
28
Reviews Analyzed
17,791
Brands Ranked
9
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When you see a drill bit with a distinct gold finish, you aren't just looking at an aesthetic choice. You are looking at a specialized tool designed for high-performance tasks. Gold-colored drill bits are almost universally coated with Titanium Nitride (TiN), a hard ceramic material that significantly alters how the bit interacts with heat and friction. These bits are particularly popular in the 'short' format—often referred to as stubby bits—which are engineered to provide maximum torque and control in confined spaces where a standard-length bit would wobble or bind. Whether you are working on delicate jewelry making, precision electronics, or tight automotive engine bays, choosing the right gold short drill bit requires an understanding of material hardness and coating durability.

Editor's Choice

Our Top Picks for Gold Short Drill Bits

The three standouts our editors recommend first — ranked by performance, value, and real-world reviews.

DEWALT Black Oxide Drill Bit Set, 20-Piece (DW1177) (Black & Gold)

DEWALT Black Oxide High Speed Steel Drill Bit Set

4.7 (6,706 ratings)
DEWALT DW1177 8.75 X 1.00 X 8.75 Inches 1.00 Pounds

Reviews for DEWALT (PM Score)

9.8 PM Score
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  • 135-degree split point tip of the drill bits for wood, metal or plastic is designed to help reduce walking
  • DEWALT drill bit set is made from High Speed Steel to be used in plastic, wood, and metal
  • Tapered web design for extreme durability and resisting breakage of the drill bits
  • Black and gold coating to help prevent rust and wear
  • 3-Flats shank to reduce spin-out in the chuck*
  • Size markings on the drill bit shank for identifying sizes quickly
  • Black oxide finish for greater wear protection
  • Parabolic flute design for greater bit strength
  • 135-degree split-point design reduces slip and walking
  • Includes tough case container to keep bits organized
  • Sliding soft-grip lock keeps case closed securely
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
UnbeatableSale, Inc 9.83 No No No

Why settle for bits that wander across your workpiece the moment you pull the trigger? This DEWALT 20-piece set solves that frustration with a 135-degree split point tip designed specifically to kill bit walking. Built from high-speed steel, these bits handle wood, metal, and plastic with ease, thanks to a parabolic flute design that boosts overall strength. I noticed the tapered web design really helps prevent the snapping that usually plagues thinner bits during heavy drilling. The black oxide and gold coating provide a solid defense against rust, while the 3-flats shank ensures they stay locked tight in your chuck without spinning out. Even the small details, like the size markings on the shank and the secure soft-grip storage case, make this a professional-grade kit that stays organized and ready for the next job.

What We Like
Split point tip
Black oxide finish
Tapered web design
3-flats shank
Secure storage case

Drill America GLBCOX65/32 5/32" x 6" Cobalt Aircraft Extension Drill Bit, GLBCO Series

Drill America Cobalt Aircraft Extension Drill Bit

4.8 (170 ratings)
DRILL AMERICA GLBCOX65/32

Reviews for DRILL AMERICA (PM Score)

9.8 PM Score
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  • Effective in drilling tough, high tensile strength materials like stainless steel, inconel and titanium
  • 135° split point tip prevents drill from walking
  • Round shanks allow use with a wide variety of tool holding systems
  • Gold oxide is a thinner oxide surface treatment than black oxide typically used to identify cobalt steel tools. Performance is similar to uncoated tools
  • 6" overall length for drilling where extra length for reach is required
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68 Yes Yes Yes

Most people assume a thinner oxide coating means a weaker tool, but this gold oxide treatment on the Drill America cobalt bit is actually a strategic advantage. By keeping the surface treatment thinner than standard black oxide, it maintains performance levels nearly identical to uncoated tools while providing essential protection. This 6-inch extension bit is a lifesaver when you need extra reach to penetrate high-tensile materials like titanium, inconel, or stainless steel. I found the 135° split point tip to be a game-changer because it bites immediately, preventing that frustrating bit-walking that ruins precision work. Since it features a standard round shank, it integrates seamlessly into almost any tool holding system you already have in your shop.

What We Like
Cobalt steel construction
135° split point
Extra reach length
Tough material performance
Versatile round shank

Drill America 3/16" x 6" Cobalt Aircraft Extension Drill Bit, GLBCO Series

Drill America Cobalt Aircraft Extension Drill Bit

4.6 (1,942 ratings)
DRILL AMERICA GLBCOX63/16 6.00 X 4.00 X 2.00 Inches 1.00 Pounds

Reviews for DRILL AMERICA (PM Score)

9.8 PM Score
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  • Effective in drilling tough, high tensile strength materials like stainless steel, inconel and titanium
  • 135° split point tip prevents drill from walking
  • Round shanks allow use with a wide variety of tool holding systems
  • Gold oxide is a thinner oxide surface treatment than black oxide typically used to identify cobalt steel tools. Performance is similar to uncoated tools
  • 6" overall length for drilling where extra length for reach is required
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68 Yes Yes Yes

Machinists working with high-tensile metals like Inconel or titanium require specialized tooling that won't quit halfway through a hole. This Drill America cobalt extension bit is a lifesaver when you need extra reach without sacrificing stability. The 6-inch length provides that crucial clearance, while the 135° split point tip is a game-changer because it bites into the material immediately rather than walking across your workpiece. I noticed the gold oxide finish is much thinner than standard black oxide, which keeps the performance close to an uncoated tool while still identifying it as high-grade cobalt. Because it uses a round shank, you can easily swap it into almost any tool holding system you already have in your shop.

What We Like
High tensile strength
Split point tip
Extra reach length
Round shank design
Gold oxide finish

Drill America - KFD29J-PC 29 Piece Heavy Duty High Speed Steel Drill Bit Set with Black and Gold Finish in Round Case (1/16" - 1/2" x 64ths), KFD Seri...

Drill America Heavy Duty High Speed Steel Drill Bit Set

4.6 (1,115 ratings)
DRILL AMERICA KFD29J-PC 7.00 X 3.25 X 3.50 Inches 2.08 Pounds

Reviews for DRILL AMERICA (PM Score)

9.8 PM Score
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  • Assortment of 29 jobber length drill bits includes inch sizes 1/16" to 1/2" in 1/64" increments
  • High-speed steel (HSS) provides hardness for wear resistance
  • Black and gold oxide finish resists corrosion and increases the hardness of the drill bit
  • Self-centering 135-degree split point penetrates hard material without a pilot hole and produces small chips to reduce clogging
  • Comes in a plastic storage case
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
AirweldOnline 7.93 No No No

The distinctive black and gold oxide finish on these bits catches the light immediately, signaling a level of durability that goes beyond standard hardware store finds. I found that the 135-degree split point is the real hero here, biting into tough materials instantly without the frustrating wander that usually requires a pilot hole. Because they are crafted from high-speed steel, these jobber length bits handle heat and wear with impressive resilience. The set covers a comprehensive range from 1/16" to 1/2" in precise 1/64" increments, all tucked away in a sturdy plastic case that keeps your workspace organized. Whether you are drilling through metal or dense timber, the chip-producing design helps prevent the clogging that typically stalls a project mid-stream.

What We Like
High-speed steel construction
Corrosion resistant finish
Self-centering split point
Reduced chip clogging
Organized storage case

COMOWARE Cobalt Drill Bit Set- 15Pcs M35 High Speed Steel Twist Jobber Length for Hardened Metal, Stainless Steel, Cast Iron and Wood Plastic with Ind...

COMOWARE M35 Cobalt High Speed Steel Drill Bit Set

4.5 (5,206 ratings)
COMOWARE CNCOBALT-15

Reviews for COMOWARE (PM Score)

9.7 PM Score
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  • HIGH QUALITY MATERIAL: 5% Cobalt High Speed Steel M35 provide extended tool life compared to ordinary drill bits. Durable and strong
  • TWIST DESIGN & PERFORMANCE: PRECISE 135°SPLIT POINT, gold oxide finish and round straight shanks. Prevent walking, clear chips and particles faster.Produced by precision fully ground which ensures chips move smoothly.
  • PROFESSIONAL & WIDELY USE: M35 Cobalt HSS is more suitable for hardened material. Particularly successful in cutting through hard metals such as stainless steel, cast iron, high temperature alloy, titanium alloy, hard plastics and woods, and also can be used for softer materials.
  • SIZE INCLUDED: 15pcs jobber length drill bit set with plastic storage case including sizes:1/16" 2pc,5/64" 1pc ,3/32" 2pc,7/64" 1pc,1/8" 2pc ,9/64" 1pc, 5/32" 1pc, 3/16" 1pc, 7/32" 1pc, 1/4" 1pc, 5/16" 1pc, 3/8" 1pc.
  • 100% SATISFACTION GUARANTEE: If you are not 100% satisfied with your purchase for any reason whatsoever simply please feel free to contact us.
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
TG tools 9.94 Yes Yes Yes

Most DIYers settle for standard HSS bits that dull the moment they hit stainless steel, but the COMOWARE Cobalt set is built for much tougher battles. I found that the 5% cobalt M35 composition makes a massive difference when you're working through hardened metals like cast iron or titanium alloys. The 135° split point is a game changer because it stops the bit from walking across your workpiece, allowing for a much cleaner start. Thanks to the precision-ground twist design and gold oxide finish, chip evacuation is smooth and fast, which prevents overheating. Whether you are drilling through hard plastics or heavy-duty alloys, this 15-piece jobber length collection feels professional and reliable for serious shop work.

What We Like
5% Cobalt M35 steel
135° split point
Gold oxide finish
Indexed storage case
Precision fully ground

Drill America 25 Piece Metric Cobalt Drill Bit Set in Round Case, Heavy Duty, Gold Oxide Finish for Drilling Metal, Wood, Plastic, Sizes 1mm to 13mm b...

Drill America 25 Piece Metric Cobalt Drill Bit Set

4.5 (910 ratings)
DRILL AMERICA ZMD/A4025-CO-PC

Reviews for DRILL AMERICA (PM Score)

9.5 PM Score
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  • HIGHER SPEED DRILL: Manufactured to National Aerospace Standard 907 and made of heat-resistant cobalt, these drill bits display higher red hardness which permits speeds up to 30% greater than high speed steel drills
  • BEST USES: The m35 5% cobalt drills are effective in drilling tough, high tensile strength materials such as Inconel, stainless steel and titanium, as well as wood, plastic and other hard metals
  • 135 DEGREE CUTTING ANGLE: Jobber length drill bits have a 135 degree split point for self-centering, fast penetration, and drilling with precision
  • METRIC SIZES INCLUDED: Full 25pc drill bit set comes with plastic storage holder case and includes metric sizes ranging from 1mm to 13mm by 0.5mm
  • ABOUT DRILL AMERICA: Drill America specializes in supplying a full line of industrial and contractor cutting tools since 1923. Our products include drills, taps and dies, reamers, end mills, carbide burs, countersinks and more
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68 Yes Yes Yes

Professional machinists and heavy-duty contractors will find this cobalt set to be a top-tier essential for high-stress environments. Because these bits are manufactured to National Aerospace Standard 907, they possess a red hardness that allows you to run them up to 30% faster than standard high-speed steel alternatives. I was particularly impressed by the ability to bite into tough, high-tensile materials like Inconel, titanium, and stainless steel without losing precision. The 135-degree split point is a game changer for self-centering, preventing that annoying wander when you first touch the workpiece. With a comprehensive range of metric sizes from 1mm to 13mm housed in a sturdy round case, this kit offers the reliability required for serious industrial applications.

What We Like
Heat-resistant cobalt
135-degree split point
High-speed drilling
Tough metal capability
Metric size range

Drill America - D/ASTCO3/16P12 3/16" Cobalt Heavy Duty Split Point Stub Drill Bit (Pack of 12), D/ASTCO Series

Drill America Cobalt Heavy Duty Stub Drill Bits

4.4 (104 ratings)
DRILL AMERICA D/ASTCO3/16P12 6.00 X 4.00 X 2.00 Inches 1.00 Pounds

Reviews for DRILL AMERICA (PM Score)

9.4 PM Score
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  • Cobalt steel tools are similar to high-speed steel, but with more cobalt for improved performance when cutting harder metals such as stainless steel or nickel alloys
  • Gold oxide is a thinner oxide surface treatment than black oxide typically used to identify cobalt steel tools. Performance is similar to uncoated tools
  • Round shanks allow use with a wide variety of toolholding systems
  • When run in a counterclockwise direction (right-hand cut) spiral fluted tools evacuate chips up and out of the cut to reduce clogging
  • Ideal for portable or machine drilling
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68 Yes Yes Yes

Why settle for standard high-speed steel when your projects demand the extra bite of cobalt? I found that these Drill America stub bits are a game-changer for anyone frequently working with stubborn materials like stainless steel or nickel alloys. The high cobalt content provides that necessary edge for harder metals, while the gold oxide finish keeps the surface thin enough to maintain performance comparable to uncoated tools. I really liked the right-hand cut spiral flutes. They do a fantastic job of evacuating chips up and out of the hole, which significantly cuts down on clogging. Whether you are using a handheld drill or a stationary machine, the round shanks make them incredibly versatile for almost any toolholding system you have in your shop.

What We Like
Cobalt steel construction
Hard metal performance
Efficient chip evacuation
Versatile round shanks
Gold oxide finish

Drill America - D/ASTCO1/4P12 1/4" Cobalt Heavy Duty Split Point Stub Drill Bit (Pack of 12), D/ASTCO Series

Drill America Cobalt Heavy Duty Stub Drill Bits

4.4 (104 ratings)
DRILL AMERICA D/ASTCO1/4P12 6.00 X 4.00 X 2.00 Inches

Reviews for DRILL AMERICA (PM Score)

9.4 PM Score
Buy on Amazon
  • Cobalt steel tools are similar to high-speed steel, but with more cobalt for improved performance when cutting harder metals such as stainless steel or nickel alloys
  • Gold oxide is a thinner oxide surface treatment than black oxide typically used to identify cobalt steel tools. Performance is similar to uncoated tools
  • Round shanks allow use with a wide variety of toolholding systems
  • When run in a counterclockwise direction (right-hand cut) spiral fluted tools evacuate chips up and out of the cut to reduce clogging
  • Ideal for portable or machine drilling
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68 Yes Yes Yes

The distinct gold oxide finish on these bits immediately signals that you are dealing with serious cobalt steel rather than standard high-speed alternatives. I found that the extra cobalt content makes a massive difference when you are pushing through stubborn materials like stainless steel or nickel alloys that usually chew up lesser bits. These stub drills feature a right-hand cut spiral flute design that does a great job of evacuating chips up and out of the hole, which prevents that frustrating clogging during deep cuts. Because they utilize round shanks, they fit seamlessly into almost any toolholding system I tested, whether I was using a handheld portable drill or a stationary machine. It is a reliable, heavy-duty set for anyone who needs to tackle harder metals without constant tool failure.

What We Like
Cobalt steel construction
Gold oxide finish
Efficient chip evacuation
Round shank design
Hard metal performance

29PC Stubby Industrial Black & Gold Drill Bit Set 135 Degree Split Point

Vector Tools Industrial Stubby Drill Bit Set

4.4 (162 ratings)
VECTOR TOOLS 10033 8.00 X 3.00 X 5.00 Inches

Reviews for VECTOR TOOLS (PM Score)

9.4 PM Score
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  • 1/16" to 1/2" in 1/64" increments
  • 135 degree split point, Fully ground, Self-centering, Stubby length
  • Black/gold colored finish
  • Neatly organized in a Metal Case, Drill Indexed
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
JR Quality Tools 9.84 Yes Yes Yes

The heavy weight of the metal case tells you immediately that this isn't a cheap plastic kit destined for the junk drawer. Vector Tools has designed this 29-piece set with a specific focus on tight workspaces where standard-length bits usually fail. The stubby profile allows you to maneuver in cramped corners, while the 135-degree split point does the heavy lifting by self-centering right from the start. I found the incremental sizing from 1/16" to 1/2" incredibly precise for detailed work, and the black and gold finish gives the whole set a professional, industrial aesthetic. Having them neatly organized and drill-indexed in that sturdy case makes grabbing the exact size you need a seamless part of your workflow.

What We Like
Stubby length design
135-degree split point
Self-centering tips
Metal storage case
Drill indexed organization

COMOWARE Number Size Drill Bit Set 60pcs- Jobber Length Drill Bits, Wire Gauge 1 to 60, Black and Gold Finish, 135° Split Point, High Speed Steel with...

COMOWARE 60-Piece Number Size Drill Bit Set

COMOWARE JOBBERBG-60N 2.20 X 4.10 X 5.10 Inches

Reviews for COMOWARE (PM Score)

9.2 PM Score
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  • High Quality Material - Versatile general-purpose drill bit set, High Speed Steel, black and gold finish resists corrosion and increases the hardness of the drill bit.
  • 135-degree Point Tip & Twist Design - Increases cutting speed with self-centering and prevents walking, clears chips and particles faster. Produced by precision fully ground which ensures chips move smoothly.
  • Professional and Widely Use - Great drill bits set for metal/ wood/ plastic. Suitable for Home DIY, and General Building/ Engineering/ Woodworking Use.
  • Set Including - The set includes wire gage size #1 to #60, can meet your different demands perfectly.
  • Organized Holder - Set includes the drill bit holder with size index for easy storage and organizing.
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
TG tools 9.94 Yes Yes Yes

You might assume a budget-friendly drill set is just another collection of bits that will dull after a single project, but the COMOWARE number size set actually holds its own in a busy workshop. These high-speed steel bits feature a specialized black and gold finish that isn't just for show. It significantly boosts hardness and resists corrosion during heavy use. I was particularly impressed by the 135-degree split point design, which prevents the bit from walking across your workpiece and allows for much faster, self-centering starts. Whether you are drilling through metal, wood, or plastic, the precision-ground twist design clears chips efficiently to prevent clogging. The included metal indexed storage case keeps all sixty wire gauge sizes organized and easy to grab when you are mid-task.

What We Like
High speed steel
135-degree split point
Corrosion resistant finish
Metal indexed case
Self-centering design

Drill America - D/ACO3/8X1/2 1/2" Cobalt Reduced Shank Drill Bit with 3/8" Shank, D/ACO Series

Drill America Cobalt Reduced Shank Drill Bit

DRILL AMERICA D/ACO3/8X1/2 6.00 X 4.00 X 2.00 Inches

Reviews for DRILL AMERICA (PM Score)

9.1 PM Score
Buy on Amazon
  • Cobalt steel tools are similar to high-speed steel, but with more cobalt for improved performance when cutting harder metals such as stainless steel or nickel alloys
  • Gold oxide is a thinner oxide surface treatment than black oxide typically used to identify cobalt steel tools. Performance is similar to uncoated tools
  • Round shanks allow use with a wide variety of toolholding systems
  • When run in a counterclockwise direction (right-hand cut) spiral fluted tools evacuate chips up and out of the cut to reduce clogging
  • Manufactured to National Aerospace standard 907
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68 Yes Yes Yes

Machinists tackling stainless steel or stubborn nickel alloys need this specific cobalt bit in their arsenal to avoid constant tool failure. Unlike standard high-speed steel, the increased cobalt content in this Drill America tool provides the thermal stability required for much harder metals. The gold oxide finish is a smart touch, offering a thinner surface treatment that maintains performance levels similar to uncoated tools. I particularly like the spiral fluted design, which works efficiently in a right-hand cut to evacuate chips upward and out of the hole, significantly reducing the risk of clogging during deep drilling. Because it features a round shank and meets National Aerospace standard 907, it offers professional-grade reliability and compatibility across a wide range of toolholding systems.

What We Like
Cobalt steel construction
Gold oxide finish
Spiral fluted design
Aerospace standard compliant
Round shank compatibility

Chicago Latrobe - 69887 1V713 550 Series Cobalt Steel Jobber Length Drill Bit Set With Metal Case, Gold Oxide Finish, 135 Degree Split Point, Inch, 21...

Chicago Latrobe Cobalt Steel Drill Bit Set

4.4 (84 ratings)
CHICAGO LATROBE 69887 1.10 X 7.30 X 4.20 Inches 1.55 Pounds

Reviews for CHICAGO LATROBE (PM Score)

8.6 PM Score
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  • Set of 21 jobber length drill bits includes inch sizes 1/16" through 3/8" in 1/64" increments
  • Cobalt steel provides extended tool life compared to high-speed steel drill bits when drilling hard materials
  • Gold oxide finish lubricates and provides wear resistance on ferrous materials
  • Self-centering 135-degree split point penetrates hard material without a pilot hole and produces small chips to reduce clogging
  • Extra thick web for increased strength and rigidity compared to standard drill bits
  • Made in the USA
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68 Yes Yes Yes

You might wonder if a premium price tag actually translates to better performance in the workshop, but this Chicago Latrobe cobalt steel set proves the investment is worthwhile. While standard high-speed steel bits often struggle or dull quickly against tougher metals, these jobber length bits are built for longevity. The 135-degree split point is a total game-changer because it bites into hard materials immediately without needing a pilot hole, and the gold oxide finish keeps things running smoothly on ferrous metals. I particularly noticed the extra thick web construction, which adds a level of rigidity you just don't get with cheaper alternatives. It is a robust, American-made collection that covers everything from 1/16" to 3/8" in precise 1/64" increments.

What We Like
Cobalt steel construction
Self-centering split point
Gold oxide finish
Extra thick web
Made in USA

uxcell Reduced Shank Twist Drill Bits 12mm High Speed Steel 6542 with 10mm Shank for Stainless Steel Alloy Metal Plastic Wood

uxcell High Speed Steel Reduced Shank Twist Drill Bit

4.4 (62 ratings)
UXCELL A19102500UX0077

Reviews for UXCELL (PM Score)

7.5 PM Score
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  • Features: Cutting Edge Diameter : 12mm / 0.47". Shank Diameter : 10mm / 0.39". Cutting Edge Length: 63mm / 2.48". Total Length : 150mm / 6.0". Cutting Direction: Right Hand
  • High Speed Steel Tool: The twist drill bits are good for most general purpose applications, offering a combination of hardness and toughness for wear resistance. High cutting edge strength, fast cutting speed.
  • Reduced Shank: Reduced shank drill expands the size range capacity of a portable drill chuck. Common flute and overall length for minimal adjustment during tool changes. Sharp and spiral cutting edge provides neat and smooth cuts.
  • Black & Gold Oxide Finish: Premium gold titanium and black nitride dual coating can apply lubricant better for smoother drilling and is more durable and corrosion resistant. Spiral groove facilitates the export of metal chip, saving time and effort in operation.
  • Versatile Uses: For use in a wide range of stainless steel, aluminum alloy, iron, copper, brass, wood, plastic, and other metal materials. Suitable for hand drills, bench drills, etc. Tri-flat on the shank of drills are constructed for tighter chucking maximizing security for precise holes.
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
uxcell 9.95 Yes Yes Yes

Standard drill chucks often limit your ability to use larger bits, but the uxcell reduced shank design solves this compatibility bottleneck by fitting a 12mm cutting edge into a 10mm shank. During testing, the high-speed steel construction provided a reliable balance of hardness and toughness, making it easy to move through stainless steel and aluminum alloys without losing edge integrity. The dual black and gold oxide coating isn't just for show. It helps retain lubricant for smoother operation and offers much-needed corrosion resistance. I particularly liked the tri-flat shank design, which ensures the bit stays locked tightly in the chuck during high-torque tasks. Whether you are using a handheld drill or a stationary bench drill, the spiral grooves do a great job of clearing metal chips quickly.

What We Like
Reduced shank design
Dual oxide coating
Tri-flat shank
High speed steel
Efficient chip evacuation

Drill America 29 Piece m42 Cobalt Screw Machine (Stub) Drill Bit Set (Sizes A - Z), D/ASTCO Series

Drill America M42 Cobalt Screw Machine Drill Set

DRILL AMERICA D/A26S-CO-SET

Reviews for DRILL AMERICA (PM Score)

6.4 PM Score
Buy on Amazon
  • Cobalt steel tools are similar to high-speed steel, but with more cobalt for improved performance when cutting harder metals such as stainless steel or nickel alloys
  • Gold oxide is a thinner oxide surface treatment than black oxide typically used to identify cobalt steel tools. Performance is similar to uncoated tools
  • Round shanks allow use with a wide variety of toolholding systems
  • When run in a counterclockwise direction (right-hand cut) spiral fluted tools evacuate chips up and out of the cut to reduce clogging
  • 26 piece drill bit set comes in a metal case
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68 Yes Yes Yes

You are staring down a stubborn block of stainless steel that has already chewed through two standard high-speed steel bits, and that is exactly where this Drill America set proves its worth. These M42 cobalt tools are engineered specifically for those high-heat, high-friction scenarios where nickel alloys tend to win. The gold oxide surface treatment is a smart touch, providing a thinner coating that maintains performance similar to uncoated tools while making the cobalt steel easy to identify. I found the spiral flutes work efficiently, pulling chips up and out of the cut to prevent the dreaded clogging that ruins precision work. With a full range of sizes from A to Z housed in a sturdy metal case, this set is a reliable backbone for any serious machine shop setup.

What We Like
M42 cobalt steel
Gold oxide treatment
Efficient chip evacuation
Round shank design
Durable metal case

Drill America 29 Piece m42 Cobalt Drill Bit Set (1/16" - 1/2" X 64ths), D/ACO Series

Drill America 29 Piece M42 Cobalt Drill Bit Set

DRILL AMERICA D/A29J-CO-SET 3.26 Pounds

Reviews for DRILL AMERICA (PM Score)

6.3 PM Score
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  • Cobalt steel tools are similar to high-speed steel, but with more cobalt for improved performance when cutting harder metals such as stainless steel or nickel alloys
  • Gold oxide is a thinner oxide surface treatment than black oxide typically used to identify cobalt steel tools. Performance is similar to uncoated tools
  • Round shanks allow use with a wide variety of toolholding systems
  • When run in a counterclockwise direction (right-hand cut) spiral fluted tools evacuate chips up and out of the cut to reduce clogging
  • 29 piece drill bit set comes in a metal case
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68 Yes Yes Yes

The Drill America 29 Piece M42 Cobalt Drill Bit Set is a heavy-duty powerhouse designed specifically for conquering stubborn materials like stainless steel and nickel alloys. After testing these, the extra cobalt content in the steel really stands out, providing a level of heat resistance and durability that standard high-speed steel just can't match. I found the gold oxide surface treatment to be a smart touch. It's thinner than traditional black oxide, which keeps the cutting performance close to an uncoated tool while offering necessary protection. The right-hand cut spiral flutes do a great job of evacuating chips upward to prevent clogging during deep holes. Plus, the round shanks ensure they work with almost any toolholding system you already have in your shop, all neatly organized in a sturdy metal case.

What We Like
M42 cobalt steel
Stainless steel capable
Gold oxide coating
Efficient chip evacuation
Sturdy metal case

Chicago Latrobe 550 Cobalt Steel Jobber Length Drill Bit, Gold Oxide Coated, Round Shank, 135 Degree Split Point, 1/8" Size (Pack of 12)

Chicago Latrobe Cobalt Steel Jobber Drill Bits

CHICAGO LATROBE 46608 0.20 X 4.80 X 3.00 Inches 0.10 Pounds

Reviews for CHICAGO LATROBE (PM Score)

5.4 PM Score
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  • Jobber length drill bit has a midrange drilling depth for general-purpose applications
  • Cobalt steel provides extended tool life compared to high-speed steel drill bits when drilling hard materials
  • Gold oxide finish lubricates and provides wear resistance on ferrous materials
  • Self-centering 135-degree split point penetrates hard material without a pilot hole and produces small chips to reduce clogging
  • Extra thick web provides increased strength and rigidity compared to standard drill bits
  • Made in the USA
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Turtle & Hughes Inc. 6.76 No No No

Standard high-speed steel bits often fail prematurely when you are forced to drill through hardened metals. These Chicago Latrobe cobalt steel bits are engineered specifically to combat that frustration by offering significantly extended tool life. During testing, the 135-degree split point proved its worth by biting into tough materials immediately without the need for a pilot hole, while the gold oxide coating kept things running smoothly on ferrous metals. I was particularly impressed by the extra thick web, which adds a level of rigidity and strength you just don't find in budget-grade bits. Since these are jobber length, they hit that perfect sweet spot for general-purpose drilling depth, making them a reliable staple for any serious workshop.

What We Like
Cobalt steel construction
Self-centering split point
Gold oxide finish
Increased web strength
Made in USA

Precision Twist M40CO Cobalt Steel Short Length Drill Bit, Bronze Oxide Finish, Round Shank, Spiral Flute, 135 Degree Point Angle, 1/8" (Pack of 12)

Precision Twist Cobalt Steel Short Length Drill Bits

PRECISION TWIST DRILL M40CO1/8
  • High-speed steel (HSS) containing cobalt is a good combination of toughness and hardness, for use on drilling through hard substances
  • Gold oxide, retains cutting fluid and prevent chip to tool welding
  • 135-degree split point angle is self-centering, reduces walking, good for hard material and reduces pressure on cutting edges
  • Short-length, for better rigidity and increased strength
  • Round shanks, for use on a variety of tool-holding systems
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
No No No

Precision Twist M40CO cobalt steel drill bits deliver exceptional hardness for those tackling the toughest materials. I found the cobalt-infused high-speed steel provides that perfect balance of toughness and durability needed when you aren't working with soft metals. The 135-degree split point is a game changer because it stays self-centering, which means you won't deal with the bit walking across your workpiece. The short-length design adds a layer of rigidity that prevents snapping under pressure, while the bronze oxide finish helps retain cutting fluid to stop chips from welding to the tool. Whether you are using a standard drill or a specialized holder, the round shanks ensure these bits fit into almost any tool-holding system you own.

What We Like
Cobalt steel construction
Self-centering split point
Bronze oxide finish
Increased structural rigidity
Versatile round shanks

Ohamtes 2mm Reduced Shank Twist Drill Bits High Speed Steel HSS 4341 for Iron/Copper/Plastic/Aluminum Plates/Metal Materials, Round Shank, Double Edge...

Ohamtes HSS 4341 Reduced Shank Twist Drill Bits

OHAMTES

Reviews for OHAMTES (PM Score)

5.2 PM Score
Buy on Amazon
  • Parameter: Cutting and Shank Dia : 2mm / 0.08", Cutting Edge Length: 25mm / 0.98", Twist Drill Total Length : 49mm / 1.93".
  • Short Shank Twist Drill Bit Uses: For Stainless Steel/Aluminum Alloy/Iron/Copper/Plastic/Aluminum Plates/Metal Materials etc.
  • How To Use: When in use, The drill bit should be perpendicular to the workpiece and oil, water, or coolant should be added to keep cool.
  • Features: Premium gold titanium and black nitride dual coating, more heat and wear resistant. HSS straight shank tool strong hardness and toughness.
  • Package Content: 2 x Double Flutes Straight Shank Twist Bit.
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Aoje-Link 6.11 Yes Yes Yes

Ohamtes has delivered a specialized solution for hobbyists and technicians requiring precision in tight workspaces. These 2mm HSS 4341 drill bits stand out because of their dual-coating architecture, combining gold titanium and black nitride to boost heat resistance and longevity. During testing, the reduced shank design proved essential for navigating restricted areas where standard bits might struggle. Whether you are working through aluminum plates, copper, or stainless steel, the double-edge flute design ensures a clean cut. Just remember to keep your workpiece perpendicular and use a bit of coolant or oil to manage the temperature effectively. For a two-piece set, the hardness and toughness of these straight shank tools make them a reliable addition to any metalworking kit.

What We Like
Dual coating technology
Heat resistant
Reduced shank design
High speed steel
Double edge flutes

Chicago Latrobe 2159 High-Speed Steel Short Length Drill Bit, TiN Coated, Round Shank, 135 Degree Split Point, Letter Size N (Pack of 6)

Chicago Latrobe TiN Coated High-Speed Steel Drill Bits

CHICAGO LATROBE 48245 6.00 X 4.00 X 0.40 Inches 0.03 Pounds

Reviews for CHICAGO LATROBE (PM Score)

5.2 PM Score
Buy on Amazon
  • Manufactured to NAS 907 Type C geometry aerospace specifications
  • Manufactured from premium high-speed steel
  • 135 degree P3 split point is self-centering for reduced thrust and easier penetration
  • Shorter flute and overall length provide superior rigidity to minimize deflection when using heavy feed rates
  • Titanium nitride coatings add a hard layer of gold-colored ceramic to the surface that extends tool life and permits faster cutting speeds than uncoated tools
  • Made in the USA
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
TerraTree 9.07 No No No

Most machinists assume that shorter drill bits are just for tight spaces, but the real advantage here is the massive boost in rigidity. Because these Chicago Latrobe bits feature shorter flutes and a compact overall length, they resist deflection like a dream even when you are pushing heavy feed rates. The 135-degree P3 split point is a game changer for precision, as it centers itself immediately to prevent walking and reduces the thrust required to penetrate the material. Since they are manufactured to NAS 907 Type C aerospace specifications using premium high-speed steel, you can feel the professional grade immediately. The Titanium Nitride coating adds a tough ceramic layer that lets you run faster cutting speeds without sacrificing tool life. It is a rugged, American-made solution for serious metalworking.

What We Like
Aerospace grade geometry
Self-centering split point
Titanium nitride coating
Increased tool rigidity
Made in USA

Ohamtes 4mm Reduced Shank Twist Drill Bits High Speed Steel HSS 4341 for Iron/Copper/Plastic/Aluminum Plates/Metal Materials, Round Shank, Double Edge...

Ohamtes HSS 4341 Reduced Shank Twist Drill Bits

OHAMTES

Reviews for OHAMTES (PM Score)

5.2 PM Score
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  • Parameter: Cutting and Shank Dia : 4mm / 0.16", Cutting Edge Length: 43mm / 1.69", Twist Drill Total Length : 75mm / 2.95".
  • Short Shank Twist Drill Bit Uses: For Stainless Steel/Aluminum Alloy/Iron/Copper/Plastic/Aluminum Plates/Metal Materials etc.
  • How To Use: When in use, The drill bit should be perpendicular to the workpiece and oil, water, or coolant should be added to keep cool.
  • Features: Premium gold titanium and black nitride dual coating, more heat and wear resistant. HSS straight shank tool strong hardness and toughness.
  • Package Content: 2 x Double Flutes Straight Shank Twist Bit.
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Aoje-Link 6.11 Yes Yes Yes

Ohamtes delivers a highly specialized solution for precision drilling with these 4mm HSS 4341 twist drill bits that punch well above their weight class. What immediately caught my eye is the dual-coating approach, utilizing both gold titanium and black nitride to boost heat resistance and durability during heavy use. Whether you are working through aluminum plates, copper, or even tougher stainless steel, these bits maintain impressive hardness and toughness thanks to the high-speed steel construction. The reduced shank design is a lifesaver for tight tolerances, though you must remember to keep them perpendicular to your workpiece and use a coolant to prevent overheating. For a two-pack, the combination of a 43mm cutting edge and a sturdy 75mm total length makes these a reliable staple for any metalworking toolkit.

What We Like
Dual coating protection
Heat resistant HSS
Reduced shank design
Versatile metal cutting
High toughness steel

Chicago Latrobe 559 Cobalt Steel Short Length Drill Bit, Gold Oxide Finish, Round Shank, 135 Degree Split Point, 1/8" Size (Pack of 12)

Chicago Latrobe Cobalt Steel Short Length Drill Bits

CHICAGO LATROBE 50805 0.25 X 4.00 X 2.50 Inches 0.10 Pounds

Reviews for CHICAGO LATROBE (PM Score)

5.0 PM Score
Buy on Amazon
  • Short length drill bit offers rigidity to reduce tool deflection and breakage
  • Cobalt steel provides extended tool life compared to high-speed steel drill bits when drilling hard materials
  • Gold oxide finish lubricates and provides wear resistance on ferrous materials
  • 135-degree split point penetrates hard material without a pilot hole and produces small chips to reduce clogging
  • Extra-thick web provides increased strength and rigidity compared to standard drill bits
  • Made in the USA
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
First Harmonic Limited 9.63 No No No

The Chicago Latrobe 559 Cobalt Steel Drill Bits are absolute workhorses when you need to bite into hardened ferrous metals without the bit wandering. Because these are short-length bits, they offer incredible rigidity that virtually eliminates the tool deflection and breakage common with longer, more flexible bits. I was particularly impressed by the 135-degree split point. It bites into tough material immediately without needing a pilot hole, and the extra-thick web adds a layer of structural strength you just don't find in standard bits. The gold oxide finish isn't just for show, either, as it provides essential lubrication and wear resistance during heavy use. Since they are made in the USA, you can feel the professional-grade quality the moment you pick them up.

What We Like
Cobalt steel construction
Reduced tool deflection
135-degree split point
Gold oxide finish
Extra-thick web

Drill America 5/16" Cobalt Stubby Threaded Shank Drill Bit Overall Length 5/8, TSD Series

Drill America Cobalt Stubby Threaded Shank Drill Bit

DRILL AMERICA TSD5/16ST 6.00 X 4.00 X 2.00 Inches

Reviews for DRILL AMERICA (PM Score)

4.9 PM Score
Buy on Amazon
  • Cobalt steel tools are similar to high-speed steel, but with more cobalt for improved performance when cutting harder metals such as stainless steel or nickel alloys
  • Gold oxide is a thinner oxide surface treatment than black oxide typically used to identify cobalt steel tools. Performance is similar to uncoated tools
  • Threaded shank is for use with threaded-spindle tools, often used in aerospace and automotive applications
  • When run in a counterclockwise direction (right-hand cut) spiral fluted tools evacuate chips up and out of the cut to reduce clogging
  • Featured with 135 degrees heavy duty split point and surface treated for drilling hard, tough, high tensile strength materials
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68 Yes Yes Yes

Aerospace and automotive technicians working in tight quarters demand specialized tooling that won't quit when hitting high-tensile metals. This Drill America cobalt bit is a precision powerhouse designed specifically for threaded-spindle tools where space is at a premium. The high cobalt content makes it a much better choice than standard high-speed steel when you are tackling stubborn stainless steel or nickel alloys. I found the 135-degree heavy-duty split point particularly impressive for maintaining stability in tough materials. Because the spiral flutes are designed for a right-hand cut, they effectively evacuate chips upward to prevent frustrating clogs mid-drill. Even with the gold oxide surface treatment, which keeps performance close to an uncoated tool, the durability remains top-tier for demanding industrial applications.

What We Like
Cobalt steel construction
Threaded shank design
Heavy duty split point
Efficient chip evacuation
Gold oxide treatment

OXTUL 3/8 inch, 6 Pcs Drill Bits, High Speel Steel, 3 Flat Shank

OXTUL M2 High Speed Steel Drill Bit Set

OXTUL

Reviews for OXTUL (PM Score)

4.8 PM Score
Buy on Amazon
  • Cobalt drill bits: Classic M2 High Speed Steel construction with Black and Gold finish for proven capability and durability.
  • Hardness: M2 Twist drill bits’ Rock wall Hardness Level HRC 62-63.
  • Package & Size: 6 Pieces drill bits in a plastic bag, Diameter 3/8 inch, Total length 5 inch, Working length 3-5/8 inch.
  • Professional & DIY Use: For use on metal, wood & plastics. Not For Use On Concrete / Masonry. Perfect match for workshop or service vehicles.
  • 135 Tip & Twist Design: Increases cutting speed with self-centering and prevents walking, clears chips and particles faster.
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
YOUR TOOLS 7.33 Yes Yes Yes

Most DIYers settle for flimsy bits that wander across the surface, but the OXTUL 3/8 inch drill bit set is engineered to bite right where you intend. These M2 High Speed Steel bits feature a specialized 135-degree tip and a twist design that self-centers immediately, effectively preventing that frustrating bit-walking during the initial puncture. With a rock-hard HRC 62-63 rating and a durable black and gold finish, they handle metal, wood, and plastics with professional-grade ease. I found the 5-inch total length provides a solid reach for workshop tasks, while the chip-clearing design ensures you aren't constantly pausing to clear debris. It is a reliable, heavy-duty addition to any service vehicle or home toolbox.

What We Like
M2 High Speed Steel
Self-centering 135 tip
HRC 62-63 hardness
Rapid chip clearing
Metal and wood compatible

Chicago Latrobe 520 Cobalt Steel Long Length Drill Bit, Gold Oxide Coated, Round Shank, 135 Degree Split Point, 1/2" Size (Pack of 1)

Chicago Latrobe Cobalt Steel Long Length Drill Bit

CHICAGO LATROBE 44832 8.09 X 0.55 X 0.55 Inches 0.66 Pounds

Reviews for CHICAGO LATROBE (PM Score)

4.8 PM Score
Buy on Amazon
  • Long length drill bit has an extended flute and overall length to drill deeper and reach farther than a jobber length drill bit
  • Cobalt steel provides extended tool life compared to high-speed steel drill bits when drilling hard materials
  • Gold oxide finish lubricates and provides wear resistance on ferrous materials
  • Self-centering 135-degree split point penetrates hard material without a pilot hole and produces small chips to reduce clogging
  • Extra thick web provides increased strength and rigidity compared to standard drill bits
  • Made in the USA
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68 Yes Yes Yes

Machinists working with high-density ferrous metals need to stop wasting time with standard jobber bits and upgrade to this Chicago Latrobe cobalt powerhouse. The extended flute and long-length design are absolute game-changers when you are chasing deep, hard-to-reach bores that shorter bits simply cannot touch. Because it is constructed from cobalt steel rather than standard high-speed steel, this bit maintains its edge significantly longer under intense heat and pressure. I particularly appreciate the 135-degree split point. It bites into the material immediately without needing a pilot hole, and the gold oxide coating keeps things lubricated to prevent seizing. With an extra thick web for added rigidity, this bit feels incredibly sturdy and professional-grade.

What We Like
Cobalt steel construction
Extended flute length
Self-centering split point
Gold oxide coating
Increased web strength

Drill America - KFD1008-SET 8 Piece Heavy Duty High Speed Steel Reduced Shank Drill Bit Set (9/16" - 1" x 16ths), KFD Series

Drill America Heavy Duty Reduced Shank Drill Bit Set

DRILL AMERICA KFD1008-SET 6.00 X 4.00 X 2.00 Inches 4.00 Pounds

Reviews for DRILL AMERICA (PM Score)

4.6 PM Score
Buy on Amazon
  • Manufactured from M2 premium grade high speed steel
  • For use in a wide range of materials in the iron and steel families such aluminum, iron, stainless steel and other hard metal drilling
  • 135 degree split point tip for self-centering and reducing thrust
  • Black and gold surface treated for use in stainless steel and other hard metal drilling
  • Reduced Shank Drills expand the size range capacity of a portable drill chuck. Common flute and overall length for minimal adjustment during tool changes
  • 8 Piece Set with 1/2" Reduced Shank Drill Bits
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68 Yes Yes Yes

Most machinists assume that upgrading your drill capacity requires a complete overhaul of your power tool collection, but this set proves otherwise. By utilizing a 1/2 inch reduced shank, these Drill America bits allow you to bore much larger holes without needing a massive industrial drill press. I found the M2 premium grade high speed steel to be incredibly resilient, especially when paired with the black and gold surface treatment designed for tough stainless steel. The 135 degree split point tip is a game changer because it centers itself instantly, which significantly cuts down on the physical thrust you have to apply. Because the flute and overall length remain consistent, you won't spend your whole day constantly recalibrating your setup during tool changes.

What We Like
M2 high speed steel
135 degree split point
Reduced shank design
Black and gold coating
Stainless steel capable

Drill America 2.50mm Cobalt Metric Drill Bit (Pack of 12), D/AMMCO Series

Drill America Cobalt Metric Drill Bit Set

DRILL AMERICA D/AMMCO2.50P12 6.00 X 4.00 X 2.00 Inches

Reviews for DRILL AMERICA (PM Score)

4.5 PM Score
Buy on Amazon
  • Cobalt steel tools are similar to high-speed steel, but with more cobalt for improved performance when cutting harder metals such as stainless steel or nickel alloys
  • Gold oxide is a thinner oxide surface treatment than black oxide typically used to identify cobalt steel tools. Performance is similar to uncoated tools
  • Round shanks allow use with a wide variety of toolholding systems
  • When run in a counterclockwise direction (right-hand cut) spiral fluted tools evacuate chips up and out of the cut to reduce clogging
  • Manufactured to National Aerospace standard 907
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68 Yes Yes Yes

Standard high-speed steel bits often fail the moment they hit tough alloys, but these Drill America cobalt bits are engineered for the heavy lifting. While most hobbyist bits struggle with resistance, the increased cobalt content in this D/AMMCO series allows you to slice through stainless steel and nickel alloys with much higher efficiency. I noticed the gold oxide finish is notably thinner than typical black oxide, which keeps the tool performance close to an uncoated state for maximum precision. The right-hand spiral flutes do a great job of pulling chips up and out of the hole, preventing the clogging that usually ruins a clean cut. Plus, since they feature round shanks and meet National Aerospace standard 907, they are incredibly versatile for various toolholding systems.

What We Like
High cobalt content
Stainless steel capable
Efficient chip evacuation
Aerospace standard quality
Versatile round shanks

Ohamtes 5.5mm Reduced Shank Twist Drill Bits High Speed Steel HSS 4341 for Iron/Copper/Plastic/Aluminum Plates/Metal Materials, Round Shank, Double Ed...

Ohamtes 5.5mm HSS 4341 Twist Drill Bit Set

OHAMTES

Reviews for OHAMTES (PM Score)

4.2 PM Score
Buy on Amazon
  • Parameter: Cutting and Shank Dia : 5.5mm / 0.22", Cutting Edge Length: 55mm / 2.17", Twist Drill Total Length : 93mm / 3.66".
  • Short Shank Twist Drill Bit Uses: For Stainless Steel/Aluminum Alloy/Iron/Copper/Plastic/Aluminum Plates/Metal Materials etc.
  • How To Use: When in use, The drill bit should be perpendicular to the workpiece and oil, water, or coolant should be added to keep cool.
  • Features: Premium gold titanium and black nitride dual coating, more heat and wear resistant. HSS straight shank tool strong hardness and toughness.
  • Package Content: 5 x Double Flutes Straight Shank Twist Bit.
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Aoje-Link 6.11 Yes Yes Yes

Precision metalworkers and DIY enthusiasts tackling dense alloys need these Ohamtes drill bits to avoid the frustration of dulling out halfway through a project. These 5.5mm bits utilize a specialized HSS 4341 high-speed steel construction that feels incredibly sturdy in the hand. What really sets this five-piece set apart is the dual coating of gold titanium and black nitride, which significantly boosts heat and wear resistance during heavy drilling. I found that keeping the bit perpendicular to the workpiece and applying a bit of coolant or oil makes a massive difference in performance when working through aluminum or copper. Whether you are drilling through plastic or tougher iron, the double-flute design ensures a clean, efficient cut every time.

What We Like
Dual coating protection
HSS 4341 steel
Heat resistant
Double flute design
Five piece set

6 Pcs, #43 Cobalt Gold Heavy Duty Jobber Length Drill Bit, Drill America, D/Aco43, Number Of Flutes: 2. Cutting Direction: Right Hand, Flute Length: 1...

Drill America Cobalt Gold Heavy Duty Jobber Drill Bits

DRILL AMERICA D/ACO43

Reviews for DRILL AMERICA (PM Score)

0.0 PM Score
Buy on Amazon
  • Size: #43. Material: Cobalt. Finish: Gold.
  • Flute Length: 1-1/4". Overall Length: 2-1/4".
  • Shank Type: Round. Style: Jobber.
  • Cutting Angle: 135. Point Type: Split Point.
  • Number of Flutes: 2. Cutting Direction: Right Hand
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
SMARTNSAVE 8.07 No No No

Drill America delivers a serious upgrade to your metalworking toolkit with these #43 cobalt gold heavy-duty jobber length bits. I found the split point design and 135-degree cutting angle to be the real game-changers here, as they prevent the bit from walking and ensure a much cleaner entry into tough materials. Since these are crafted from cobalt with a distinct gold finish, they handle the heat of high-friction drilling far better than standard steel bits. The two-flute, right-hand cutting direction is standard for precision work, and the 1-1/4 inch flute length provides plenty of clearance for chip evacuation. Whether you are working in a professional shop or tackling a demanding home project, this six-piece set offers the durability you need for consistent, professional results.

What We Like
Durable cobalt construction
Precision split point
135-degree cutting angle
Heat resistant finish
Two flute design
Buying Guide

A Guide to Selecting the Best gold short drill bits

A Guide to Selecting the Best gold short drill bits

Understanding the Titanium Nitride Coating

The primary reason to opt for a gold-colored bit is the Titanium Nitride coating. This layer serves two critical purposes: heat reduction and surface hardness. As a drill bit rotates, friction generates intense heat that can dull the cutting edge almost instantly. The TiN coating acts as a thermal barrier, allowing the bit to run longer and hotter without losing its temper. When shopping, ensure the guide specifies that the gold color is a coating and not just a superficial dye. A high-quality TiN coating should be uniform and tightly bonded to the substrate, typically high-speed steel (HSS), to prevent flaking during heavy-duty drilling.

Material Composition: HSS vs. Cobalt

While the gold coating provides the surface protection, the core material determines the bit's structural integrity. Most gold short bits are made from High-Speed Steel (HSS). These are excellent for general-purpose drilling in wood, plastics, and softer metals. However, if your project involves drilling through stainless steel or harder alloys, look for bits that combine the gold coating with a Cobalt substrate. Cobalt bits are inherently more heat-resistant than standard HSS, and when paired with a titanium coating, they become a powerhouse for heavy-duty industrial applications. If you are a hobbyist, standard HSS with TiN coating is usually sufficient. If you are a professional machinist, prioritize Cobalt-based gold bits.

The Importance of Bit Geometry and Length

Since you are specifically looking for 'short' bits, the geometry of the flute and the tip is paramount. Short bits are prone to 'walking' (sliding across the surface) if they do not have a sharp, centered point. Look for bits with a 118-degree or 135-degree split point. A 135-degree split point is more aggressive and helps the bit bite into the material immediately, which is vital when you have limited leverage due to the short shank. Furthermore, examine the flute design. A deep, spiral flute is essential for short bits to ensure that metal shavings (swarf) are cleared quickly from the hole. Because short bits have less room for debris to escape, a clogged flute can cause the bit to overheat and snap.

Shank Type and Compatibility

Before finalizing your purchase, verify the shank style. Most short drill bits come with a cylindrical shank designed for standard drill chucks. However, some specialized precision bits may feature a hex shank for use in quick-change bit holders or impact drivers. For high-precision work in tight spaces, a round shank is often preferred as it allows for more nuanced control in a manual drill press or a small handheld rotary tool. Ensure the shank diameter is compatible with your existing toolset to avoid unnecessary wobbling, which can ruin a precision hole.

Summary Recommendation Logic

To make the best decision, follow this logic: If you are working on DIY crafts or soft materials, a standard HSS gold-coated short bit is the most cost-effective choice. If you are working in a cramped mechanical environment like an engine block or a metal workshop, invest in a Cobalt-core gold bit with a 135-degree split point. Always prioritize bits that emphasize 'TiN coating' in their technical specifications to ensure you are getting the heat-resistance benefits that the gold color promises.

Ready to choose?

Jump back to our ranked picks or compare the shortlist side by side.

Frequently Asked Questions

Quick answers about Gold Short Drill Bits before you buy.

The gold color typically indicates a Titanium Nitride (TiN) coating, which increases surface hardness and reduces friction, allowing the bit to stay sharper for longer and dissipate heat more effectively.

Yes, the titanium coating is specifically designed for high-speed drilling through harder metals like steel and iron, offering superior durability and heat resistance compared to basic black oxide options.

No. Gold-coated bits are designed for metal and wood. For masonry, stone, or concrete, you must use carbide-tipped masonry bits to avoid shattering the coating and ruining the bit.

Absolutely. As long as the shank size matches your drill chuck (typically 1/4 inch), these bits are perfectly suited for both handheld cordless drivers and stationary drill presses.

Avoid applying excessive pressure and use cutting oil when drilling through thick metal. This reduces heat buildup, which is the primary cause of coating degradation.

They are capable, but stainless steel is notoriously difficult. For best results, use a bit with a high titanium content and drill at a slower speed with constant lubrication to prevent work-hardening the metal.

Most high-quality gold drill bit collections are sold in graduated sets, ranging from tiny pilot holes to large diameter bits, providing a complete range for various DIY and professional projects.

Look for bits made from High-Speed Steel (HSS) with a consistent, even coating. High-quality bits will have precise tip geometry and a smooth finish without visible imperfections in the titanium layer.
Research & Insights

Our Analysis of Gold Short Drill Bits

17,791 Reviews Analyzed
28 Products Evaluated
6.9 Avg PM Score
9 Brands Ranked

Top 10 Gold Short Drill Bits Brands on Amazon

Share of top-ranked products by brand, from our editorial analysis.

  1. 01 Drill America 13 (46.4%)
  2. 02 Chicago Latrobe 5 (17.9%)
  3. 03 Ohamtes 3 (10.7%)
  4. 04 Comoware 2 (7.1%)
  5. 05 Dewalt 1 (3.6%)
  6. 06 Oxtul 1 (3.6%)
  7. 07 Precision Twist Drill 1 (3.6%)
  8. 08 Uxcell 1 (3.6%)
  9. 09 Vector Tools 1 (3.6%)

What Our Analysis Found

We've carried out a comprehensive analysis of 17,791 reviews on Gold Short Drill Bits, using our selection criteria to identify the best options in the power tools & hand tools. Our findings reveal that most customers typically select Gold Short Drill Bits priced around $45.35.

Our team of expert editors reviewed these high-quality items and handpicked the top 28 Gold Short Drill Bits for your consideration..

We are dedicated to assisting our users in finding the right bits Products based on their needs, saving them considerable time when choosing which Gold Short Drill Bits to buy. We take pride in the number of satisfied users we've helped through our thorough and insightful reviews.

Side by Side

Comparison Table

Compare the top 28 picks at a glance — select a column to sort.

# Product Brand PM Score Rating Where to Buy
1 DEWALT Black Oxide High Speed Steel Drill Bit Set DEWALT 9.8 4.7 (6,706) Buy on Amazon
2 Drill America Cobalt Aircraft Extension Drill Bit Drill America 9.8 4.8 (170) Buy on Amazon
3 Drill America Cobalt Aircraft Extension Drill Bit Drill America 9.8 4.6 (1,942) Buy on Amazon
4 Drill America Heavy Duty High Speed Steel Drill Bit Set Drill America 9.8 4.6 (1,115) Buy on Amazon
5 COMOWARE M35 Cobalt High Speed Steel Drill Bit Set COMOWARE 9.7 4.5 (5,206) Buy on Amazon
6 Drill America 25 Piece Metric Cobalt Drill Bit Set Drill America 9.5 4.5 (910) Buy on Amazon
7 Drill America Cobalt Heavy Duty Stub Drill Bits Drill America 9.4 4.4 (104) Buy on Amazon
8 Drill America Cobalt Heavy Duty Stub Drill Bits Drill America 9.4 4.4 (104) Buy on Amazon
9 Vector Tools Industrial Stubby Drill Bit Set Vector Tools 9.4 4.4 (162) Buy on Amazon
10 COMOWARE 60-Piece Number Size Drill Bit Set COMOWARE 9.2 4.2 (821) Buy on Amazon
11 Drill America Cobalt Reduced Shank Drill Bit Drill America 9.1 4.1 (184) Buy on Amazon
12 Chicago Latrobe Cobalt Steel Drill Bit Set Chicago Latrobe 8.6 4.4 (84) Buy on Amazon
13 uxcell High Speed Steel Reduced Shank Twist Drill Bit uxcell 7.5 4.4 (62) Buy on Amazon
14 Drill America M42 Cobalt Screw Machine Drill Set Drill America 6.4 4.0 (48) Buy on Amazon
15 Drill America 29 Piece M42 Cobalt Drill Bit Set Drill America 6.3 4.2 (42) Buy on Amazon
16 Chicago Latrobe Cobalt Steel Jobber Drill Bits Chicago Latrobe 5.4 5.0 (8) Buy on Amazon
17 Precision Twist Cobalt Steel Short Length Drill Bits Precision Twist Drill 5.3 5.0 (5) Buy on Amazon
18 Ohamtes HSS 4341 Reduced Shank Twist Drill Bits Ohamtes 5.2 4.2 (20) Buy on Amazon
19 Chicago Latrobe TiN Coated High-Speed Steel Drill Bits Chicago Latrobe 5.2 5.0 (4) Buy on Amazon
20 Ohamtes HSS 4341 Reduced Shank Twist Drill Bits Ohamtes 5.2 4.2 (20) Buy on Amazon
21 Chicago Latrobe Cobalt Steel Short Length Drill Bits Chicago Latrobe 5.0 4.7 (5) Buy on Amazon
22 Drill America Cobalt Stubby Threaded Shank Drill Bit Drill America 4.9 4.5 (7) Buy on Amazon
23 OXTUL M2 High Speed Steel Drill Bit Set OXTUL 4.8 3.9 (18) Buy on Amazon
24 Chicago Latrobe Cobalt Steel Long Length Drill Bit Chicago Latrobe 4.8 4.7 (2) Buy on Amazon
25 Drill America Heavy Duty Reduced Shank Drill Bit Set Drill America 4.6 3.8 (15) Buy on Amazon
26 Drill America Cobalt Metric Drill Bit Set Drill America 4.5 3.6 (17) Buy on Amazon
27 Ohamtes 5.5mm HSS 4341 Twist Drill Bit Set Ohamtes 4.2 3.7 (10) Buy on Amazon
28 Drill America Cobalt Gold Heavy Duty Jobber Drill Bits Drill America 0.0 0.0 Buy on Amazon