Best Inch Twist Drill Bits in 2026

DURABLE AND PRECISE – Constructed with High Speed Steel (HSS) which provides a combination of hardness and toughness for wear resistance to take on intricate drilling tasks where accuracy is critical.

MULTIPLE USES – Gyros Wire Gauge Micro Drill Bits can be used with a wide range of hand and motorized tools for a better experience. These Straight Shank Mini Bits allow use with a wide variety of tool holding systems. Use with Gyros Mini Adaptor Chuck 45-01803 to use with most power rotary tools. Use with Gyros Swivel Head Pin Vise 97-01818 for all your hand drilling needs.

COMPLETE 11 PIECE SET - Gyros Mini Drill Bit Set comes complete with a range of small diameter twist drills sizes #50 (.0700”/1.778mm) through #60(.0400”/1.016mm) and therefore is preferred by Professional Craftsmen, Model Makers, Hobbyists, Jewelers, and Do-It-Yourself enthusiasts, and is a Must Have for all your drilling tasks.

JOBBER LENGTH: 1/8-inch cutting diameter, 1-5/8-inch flute length, 2-3/4-inch overall length, 135 degree split point, straight shank

MADE FROM HIGH-SPEED STEEL AND 5% COBALT: improve much higher heat resistance because of cobalt steel's high red hardness, provide strong durable performance compared to typical hss drill bits

CAN BE REPEATEDLY SHARPENED AS NEEDED: cobalt drill bit's hardness is uniform throughout the entire material, so that can be repeatedly sharpened without damaging the cutting edge allowing it to drill more than hss drill bits

COBALT STEEL - Manufactured from M35 cobalt steel, with molybdenum and cobalt added to creates a hardened alloy, measuring Rockwell hardness up to 67, extremely heat resistant; for much faster cutting and extra longer life span, with up to twelve times when compared with an average HSS drill bit.

NO CENTER PUNCH NEEDED - The 135° Quick-Cut points are self-centering and penetrate quickly with less pressure. Will not "walk" or "wander". Straight shank allows for firmly holding and accurate centering, fit for standard drill chucks and regular round collet chucks. Must be used and operated at proper RPMs for maximum efficiency

13PC METRIC BITS - The set includes 13pcs of M35 cobalt steel twist drill bits: 1.5mm, 2mm, 2.5mm, 3mm, 3.2mm, 3.5mm, 4mm, 4.5mm, 4.8mm, 5mm, 5.5mm, 6mm, 6.5mm. Well organized in a plastic indexed storage case for easy transport to your worksite.

【10Pcs 1/4" TWIST DRILL BITS】10Pcs - 1/4”(Dia 6.35mm) x 2-3/4”(Flute Length 69.85mm) Metal Drill Bits.This drill bit fits the majority of power drill currently on the market and come with a portable plastic case for easy storage and organization.

【PREMIUM HSS TITANIUM Coating】Industry grade 4341 high speed steel drill bit set, harder than 4241 HSS used in other similar drill bits set. Titanium coating increases wear-resistance and durability.

【FULLY GROUND PROCESS & 135° SPLIT POINT】Fully ground spiral groove design clears particles quickly, decreases friction and heat for a faster and cooler drilling performance. 135° Split Point with straight shank prevents walking and makes drilling precise. No center punch is needed.

Convenient Size Variety: This 29-piece bit set includes everything you need for a user-friendly experience that suits all your needs. The set comes with: 1/16", 5/64", 3/32", 7/64", 1/8", 9/64", 5/32", 11/64", 3/16", 13/64", 7/32", 15/64", 1/4", 17/64", 9/32", 19/64", 5/16", 21/64", 11/32", 23/64", 3/8", 25/64", 13/32", 27/64", 7/16", 29/64", 15/32", 31/64", 1/2" bits.

A Must For Professionals: The CaRoller drill bits sets are an excellent choice for professionals as well as DIY enthusiasts, enjoying superior durability and including various sizes that go well with your multiple needs.

Heavy Duty Construction: This wood drill bit set is made with premium grade, highly durable materials, a combination of W4 high speed steel, amber coating and black oxide finish which ensures long-lasting use and superior wear resistance!

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.

【M35 Cobalt High Speed Steel】Industry grade M35 high speed steel drill bit set, much harder than HSS used in other similar drill bits set. These drill bits contain 5% Cobalt, which increases wear-resistance and durability.

【Most Commonly-Used 20 Sizes】A complete combo set of 31 jobber length industrial drill bits for metal drilling (1/16", 5/64", 3/32", 7/64", 1/8", 9/64", 5/32", 11/64", 3/16", 13/64",7/32",15/64",1/4", 17/64", 9/32", 5/16", 11/32", 3/8", 7/16", 1/2") . They fit the majority of power drill currently on the market and comes with a portable plastic case for easy storage and organization.

【Precise & Efficient Drilling Performance】✔ Fully Ground spiral groove design clears particles quickly, decreases friction and heat for a faster and cooler drilling performance. ✔ 135° Split Point with round straight shank prevents walking and makes drilling precise and faster. No center punch is needed.

Durable and Precise – Constructed with Carbon Steel (CS) which provides a combination of hardness and toughness for wear resistance, making it ideal for complicated drilling applications requiring precision.

Multiple Uses – For a better experience, Gyros Wire Gauge Micro Drill Bits can be utilized with a variety of hand and motorized tools. Straight Shank Mini Bits are compatible with a wide range of tool holding systems. To use with most power rotary tools, use with Gyros Mini Adaptor Chuck 45-01803. For all your hand drilling needs, pair with the Gyros Swivel Head Pin Vise 97-01818

12 Micro Twist Drills – Professional Craftsmen, Model Makers, Hobbyist, Jewelers, and Do-It-Yourself enthusiasts prefer these Gyros Mini Drill Bits, which come complete with 12 (1 Dozen) small-diameter twist drills size #76 (.0200”/.508MM) providing quality and value for your money and are a Must-Have for all your drilling tasks.

Durable Construction - HSS material with black and gold coating increases lubricity, provides corrosion protection, and increases durability. Ensures longer tool life in multiple working conditions. Tapered web provides strength, durability and reduces breakage.

No Center Punch is Needed - 135° split point design for fast penetration with less pressure. Twist drill bit kit will not "Walk" or "Wander".

Parabolic Flute - Parabolic flute for better chip removal and reduced heat build-up.

Specification - 10Pcs 4mm cobalt drill bits, each kit contains a total of ten drill bits in the same size, Blade length: 43mm/1.7inch, 118 degree point, straight shank.

Material - HSS Cobalt high speed steel for super abrasive resistance in tough metals, improve much higher heat resistance because of cobalt steel's high red hardness.

Durable - HSS Cobalt Drill Bit provide strong durable performance compared to typical hss drill bits.

【M35 COBALT HIGH SPEED STEEL】1/8" drill bits for metal made from M35 Cobalt High Speed Steel and contain 5% Cobalt, which increases wear-resistance, durability and extra longer life span, so that the drill bits last through multiple uses

【135° SPLIT POINT】135°quick-cut pilot split points are self-centering and can penetrate quickly with less pressure. Straight shank of this cobalt steel drill bit allows for firmly holding and accurate centering and makes drilling precise and faster

【FULLY GROUND PROCESS】Fully ground spiral groove design clears particles quickly, decreases friction and heat for faster drilling performance

Cobalt drill bits: Classic 5% Cobalt M35 High Speed Steel construction with Titanium Coating for proven capability and durability.

Hardness: 5% Cobalt drill bits’ Rock wall Hardness Level HRC 65-66.

Package & Size: 10 Pieces drill bits in a plastic bag, Diameter 17/64 inch, Total length 4-1/8 inch, Working length 2-7/8 inch.

COBALT STEEL - Manufactured from M35 grade cobalt steel, with molybdenum and cobalt added to creates a hardened alloy, measuring Rockwell hardness up to 67, for much faster cutting and extra longer life span, with up to twelve times when compared with an average HSS drill bit.

SELF CENTERING - the 135°quick-cut splint point is self-centering and will penetrate quickly with less pressure. Will not "walk" or "wander"

FOR STAINLESS STEEL - Particularly successful in cutting through hard metals such as stainless steel and cast iron, although they can be used for softer materials, too. Not for hardened steel / high carbon steel. Try to adjust the RPM when it fails to penetrate.

COBALT STEEL - Manufactured from M35 grade cobalt steel, with molybdenum and cobalt added to creates a hardened alloy, measuring Rockwell hardness up to 67, for much faster cutting and extra longer life span, ideal for repeated drilling in metalworking.

FOR METALWORKING - Particularly successful in cutting through hard metals(hardness less than HRC38°) such as stainless steel and cast iron, although they can be used for softer materials like copper and aluminium, too. Not for hardened steel / high carbon steel. Try to adjust the RPM when it fails to penetrate.

SELF CENTERING - The 135°quick-cut pilot split points are self-centering and can penetrate quickly with less pressure. The bits will not "walk" or "wander". Straight shank allows for firmly holding and accurate centering, fit for standard drill chucks and regular round collet chucks.

Features: Cutting Edge Diameter : 12.5mm / 0.49"; Shank Diameter : 12.5mm / 0.49"; Cutting Edge Length: 102mm / 4.02"; Total Length : 150mm / 5.91"; Cutting Direction: Right Hand

High Speed Steel Tool: High-speed steel straight shank tool is good for most general purpose applications, offering a combination of hardness and toughness for wear resistance

Sharp Spiral Flutes: Provide neat and smooth cuts. High cutting edge strength, fast cutting speed. Spiral groove facilitates the export of metal chip, saving time and effort in operation.

Features: Cutting Edge Diameter : 8mm / 0.31"; Shank Diameter : 8mm / 0.31"; Cutting Edge Length: 75mm / 2.95"; Total Length : 115mm / 0.59"; Cutting Direction: Right Hand

High Speed Steel Tool: High-speed steel straight shank tool is good for most general purpose applications, offering a combination of hardness and toughness for wear resistance

Sharp Spiral Flutes: Provide neat and smooth cuts. High cutting edge strength, fast cutting speed. Spiral groove facilitates the export of metal chip, saving time and effort in operation.

Cobalt Steel - Manufactured From M35 5% Cobalt Steel, With Molybdenum And Cobalt Added To Creates A Hardened Alloy, Measuring Rockwell Hardness Up To 65, For Much Faster Cutting And Extra Longer Life Span, With Up To 10 Times When Compared with an Average HSS Drill Bit.

HSS Titanium Coating - Classic HSS Construction With Titanium Coating For Capability And Durability. The Cutting Edge Is Hardened And Honed For Sharpness.

Flutes Form - 2 Flutes Form Helps Clear Chips And Debris Away From The Bit, Decreasing Friction And Heat For A Faster, Cooler Drilling Process, Chatter-Free Design With Staggered Cutting Teeth Ensure The Precise Countersinking And Hole Smooth Clean.

Diameter: 2mm(0.08in) 2.5mm(0.09in) 3mm(0.12in) 4mm(0.16in) 4.5mm(0.18in) 5mm(0.2in) 6mm(0.24in) 7mm(0.28in).Length:about 200mm(about 7.8 inch)

Application:drill bits kit are great for most drilling jobs and materials such as aluminum, wood, plastics PVC and other different materials or your daily drill use.

Quantity:This set includes 8 pieces drill bit in different sizes of the most popular drill bits.1 pc/per size.

🔨【VARIOUS SIZES】: 29 sets of drill bits include: 1/16", 5/64", 3/32", 7/64", 1/8", 9/64", 5/32", 11/64" , 3/16", 13/64", 7/32", 15/64", 1/4", 17/64", 9/32", 19/64", 5/16", 21/64" , 11/32", 23/64", 3/8", 25/64", 13/32", 27/64", 7/16", 29/64", 15/32", 31/64", 1/2", can almost meet the needs of your daily engineering

🔨【M35 Cobalt Drill Bit】: The M35 cobalt drill is a durable, sharp and strong drill. For excellent cutting performance, the inserts are hardened and polished for sharpness and precise cuts without wobbling.

🔨【135 SPLIT POINTS】: The Cobalt drill bit is a 135° split round straight shank to prevent slippage and make the drilling process more efficient. The 135-degree pointed design increases cutting speed and accelerates the removal of chips and particles.

✅【5% COBALT TWIST DRILL BITS SET】Made from M35 Cobalt Steel with Molybdenum and Cobalt added to form a hardened alloy, can measure up to 67 Rockwell hardness, cut faster, last longer, and last longer than normal HSS drill bits 12 times.

✅【19PCS METRIC DIRLL BITS SET】The set includes 19pcs of M35 cobalt steel twist drill bits: 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7 mm, 7.5mm, 8 mm, 8.5mm, 9 mm, 9.5mm, 10 mm. Organized in a sturdy plastic storage case for easy transport to your workplace.

✅【TWIST DESIGN AND PERFORMANCE】Precise 135° SPLIT Point, Gold Oxide Surface and Round Straight Shank. Prevents walking and removes chips and particles faster. Precision fully ground to ensure smooth chip movement.

135°Split point, straight shank, sharp spiral groove, coffee bronze coating.

3/16" inch Diameter 4.8mm for reference. Real exact size is 4.76mm. 3/16" equals to 4.7625mm, this drill bit diameter is almost real 3/16".

Flute length 2 1/16"(52mm), total length 3 7/16"(86mm).

Made of High Speed Steel, high hardness,rust and corrosion resistance, long service life.

Straight shank fits with electric and cordless power drill and rotary drill. Drill bits are packed in plastic box.

Perfect for drilling in soft metal, wood, and plastics

Product Information: 10 drill bits: Each kit contains a total of ten drill bits in the same size

Accurate and Neat: 135°Quick-Cut points are self-centering and penetrate quickly with less pressure. Will not "walk" or "wander"

Excellent Performance: Bits are extremely heat resistant. Straight shank allows for firmly holding and accurate centering, fit for standard drill chucks and regular round collet chucks

High Quality Material - High Speed Steel M35 (Cobalt 5%) provide extended tool life compared to ordinary drill bits when drilling hard materials.

Characteristics - 135° split point with round straight shank, self-centering prevent walking, make drilling precise and faster. Fully Ground twist design helps clear particles faster, decreases friction and heat for a cooler drilling performance.

Widely Used - M35 Cobalt High Speed Steel is more suitable for tough, high tensile strength material. Particularly successful in cutting harden metals such as stainless steel, cast iron, high temperature alloy, titanium alloy, hard plastics and woods, and it also can be used for softer materials.

【5Pcs 3/8" Cobalt Drill Bits】5Pcs - 3/8”(Dia 9.26mm) x3-5/8”(Flute Length 92.08 mm) Metal Drill Bits.This drill bit fits the majority of power drill currently on the market and come with a portable plastic case for easy storage and organization.

【M35 Cobalt High Speed Steel】Industry grade 6542 high speed steel drill bit set, harder than 4241 HSS used in other similar drill bits set. These drill bits also contain 5% Cobalt, which increases wear-resistance and durability.

【Fully Ground Process & 135° Split Point】Fully ground spiral groove design clears particles quickly, decreases friction and heat for a faster and cooler drilling performance. 135° split point with straight shank prevents walking and makes drilling precise and faster. No center punch is needed.

High Quality Material: The combination of high-speed steel black and gold oxide finish increases drill bit's corrosion resistance and wear resistance.

135°Split Point: The 135 degree fast cutting point is automatically centered and penetrates quickly with less pressure, fully ground drill bit with sharp and durable cutting edge. Twist design for bring metal shavings up and out of the hole drill.

Features: round straight shank, self-centering design prevents walking, fully ground twist design ensures a drilling performance by decreasing friction, easily for drilling materials includs stainless steel, cast iron, alloy, wood and hard plastics.

[ Use The Drill Bits Longer ] Every Twist Drill Bit has classic High Speed Steel (HSS) construction with a titanium coating that provides ultimate durability and longer drill bit service life through multiple uses without deformation.

[ Drill Precise Holes] The cutting edge of each titanium drilll bit is hardened and honed for sharpness. It also features a chatter-free design with staggered cutting teeth to ensure precise countersinking and clean, smooth holes.

[ Have Every Size You Need ] This universal drill bit set covers sizes: 28 x 3/64", 27 x 5/64", 20 x 1/8", 10 x 5/32", 12 x 3/16", 8 x 15/64", 8 x 9/32", 3 x 5/16", 2 x 23/64", 1 x 1/2", 27 x 1/16", 27 x 3/32", 20 x 9/64", 10 x 11/64", 10 x 7/32", 12 x 1/4", 2 x 19/64", 2 x 21/64", 1 x 3/8".

【High Quality Material】：High-speed steel, also known as HSS, is the most common drill bit for metal applications. It incorporates an element with titanium that makes the drill bit harder than a typical HSS bit and thus suitable for sheet metal working and are ideal for cutting non-ferrous metals, plastic, wood board, etc

【Extra Automatic Center Punch】：You know how when you try to drill into metal or hard surfaces and your drill bit "walks" no matter how much you think it's steady? Yeah, we have a tool for that. The automatic center punch has a heavy-spring action, and you simply place the tip where you want to drill, and it punches a slight indentation in the surface. Just enough so that the drill bit won't walk

【118° Split Point】：These step drill bits have a small point angle of 118° and require less pressure when centering in the material. The point starts drilling at contact, reducing friction, pressure, and heat. The larger the point angle, the higher the contact pressure and the centering in the material requires more pressure

19pcs of Metric Twist Drill Bits - 1.0mm, 1.5mm, 2.0mm, 2.5mm, 3.0mm, 3.5mm, 4.0mm, 4.5mm, 5.0mm, 5.5mm, 6.0mm, 6.5mm, 7.0mm, 7.5mm, 8.0mm, 8.5mm, 9.0mm, 9.5mm, 10.0mm. Enough for daily use.

HSS 4241 - Made of high speed steel 4241 and coated with titanium for rust prevention.

Straight Shank and 118 Degree Point Angle - Straight shank for standard drill chucks and collet chuck to hold firmly, assuring accurate centering; Helical flute for swarf to easily get out; standard 118-degree point configuration is ideal for general purpose drilling applications.

【Drill Bit Set】：Includes1/16" 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. This 15pcs jobber length drill bit set with plastic storage case meets all your needs

【Cobalt 5% HSS】: High-Speed Steel M35(Cobalt 5%)cobalt drill bit set can effectively drill tough and high tensile materials. The M35 drill bit is especially suitable for cutting hard metals, such as stainless steel, cast iron, superalloys, titanium alloys, rigid plastics, and wood, It can also be used in soft materials

【Characteristics】: The metal drill bit is 135°split point with a round straight shank, self-centering prevents walking, and makes drilling precise and faster. Double back Angle process and full grinding process is adopted fully ground process twist design helps clear particles faster, decreases friction and heat for a cooler drilling performance