Best Inch Twist Drill Bits in 2026

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.

[SIZE] - 1mm diameter, 11mm length twist drill bit with 0.7mm shank.

[MATERIAL] - Diamond coated high speed steel(HSS) is made by spiral technology, has both toughness and hardness, is not easy to break. The drill bit is sharp, and is easy for chip removal.

[APPLICABLE MACHINE] - Widely used in rotary tool such as hand drills, drill press, flex shafts, bench drill and hanging mill.

Cemented Carbide Tip: 11mm twist drill bits are made of cemented carbide tip for long service life, more sharp and durable than others

Features: Milled U-flutes with deep-cut spiral provides fast material removal. Suitable for drilling in tough metal, including abrasive alloy and hardened steel

Use For: Drilling clean, accurate holes in sheet metal, steel, copper, brass, aluminum, plastic, wood, stainless steel and cast iron

PRODUCT NAME - Twist Drill Bit.

MATERIAL - M35 HSS with 5% Cobalt.

PARAMETER - Shank / Cutting Edge Diameter : 1.6mm;Cutting Edge Length : 20mm;Total Length : 42mm.

Twist Drill Bits: Drilling Diameter: 1mm / 0.039"; Flute Length: 20mm / 0.79"; Overall Length: 40mm / 1.57"; Cutting Hardness (Max.): HRC45. Spiral chip space design for fast and clean chip removal. Sharp cutting edge provides smooth cutting and no glitches.

Wide Applications: Widely used for drilling non-ferrous metal, cast iron, stainless steel, aluminum, copper, alloy steel, plastic, wood. Designed with the base substrate without any additional coatings, suitable for wide ranges of applications.

Material: Constructed from medium grain C2/K20 tungsten carbide, the drill bit has good toughness, high hardness (HRA89) and wear resistance. With good milling and cutting performance, can ensure high work efficiency. Carbide tool offers faster cutting speeds than other substrates.

[Specifications]- Twist Drill Bits Diameter: 2.5mm / 0.1-inch; Drill Bit Length:100mm / 3.94-inch; Shank Diameter: 2.5mm / 0.1-inch; Total Length: 160mm / 6.3-inch; 2 x Straight Shank Twist Drill Bit

[Strength and Hardness]- Made of high-speed steel. HSS(High Speed Steel) enables the drill body harder and can keep a longer drilling life.

[Twisted Design]- With the twisted design, it can improve cutting accuracy by centering the tip. It can avoid displacement of the drill bit during work, and at the same time remove debris and particles faster and easier.

Specification: Drill Bit Diameter: 1mm / 0.04-inch, Flute Length: 50mm / 1.97-inch, Shank Diameter: 1mm / 0.04-inch, Total Length: 80mm / 3.15-inch; 10 x Mini Drill Bits

High Speed Steel: Made of high-speed steel, with high hardness, heat resistance, wear resistance, durability and long service life.

Extended Drill：The jobber extended drill is suitable for a wide range of applications, allowing you to access hard-to-reach areas where ordinary drills cannot. High hardness, sharp twist drill bits will make drilling easier and more efficient.

Total Length: 58mm / 2.3"; Shank Diameter: 2.5mm

Product Name: Twist Drill Bit; Package Content: 10pcs x Twist Drill Bit

Material: HSS, Cobalt; Flute Length: 25mm / 1"

Twist Drill Bits: Drilling Diameter: 3.3mm / 0.13"; Flute Length: 35mm / 1.38";Overall Length: 60mm / 2.36". Spiral chip space design for fast and clean chip removal. Sharp cutting edge provides smooth cutting and no glitches.

Wide Applications: Suitable for precision cutting of stainless steel, alloy steel, carbon steel, tool steel non-ferrous metal, copper, plastics, etc.. Designed for drilling abrasive materials when drilling accuracy must be maintained. Can be used in high temperature drilling applications.

Material: Constructed from YG10X carbide (tungsten steel), the drill bit is hardened up to 91.5HRA, wear resistance, corrosion resistance, heat resistance, and the bending strength is greater than or equal to 2800 N/mm2.

Specification: Drill Bit Diameter: 2.5mm / 0.1-inch, Flute Length: 72mm / 2.83-inch, Shank Diameter: 2.5mm / 0.1-inch, Total Length: 120mm / 4.72-inch; 5 x Mini Drill Bits

High Speed Steel: Made of high-speed steel, with high hardness, heat resistance, wear resistance, durability and long service life.

Extended Drill：The jobber extended drill is suitable for a wide range of applications, allowing you to access hard-to-reach areas where ordinary drills cannot. High hardness, sharp twist drill bits will make drilling easier and more efficient.

Twist Drill Bit: Cutting edge diameter: 10.5mm / 0.41", 12.5mm / 0.49", cutting edge length: 88mm / 3.46", 102mm / 4.02". Features high hardness, good toughness, high wear resistance, suitable for most general purpose applications.

Wide Applications: Widely used for drilling stainless steel, aluminum alloy, iron, copper, wood and plastic. Used on electric hand drill, drilling machine and bench drill. Drill metal with high hardness or foreign substance, the rotational speed should be slower than normal drilling.

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.

Tap and Drill Bit: Tap thread size: M3 x 0.5, drill bit diameter: 2.5mm / 0.1".High-speed steel tool has high hardness and toughness for wear resistance. Good for general purpose applications.

Spiral Flute Tap: Spiral flute design, upward chip removal, right hand thread cutting. For processing blind holes and sticky materials, tapping aluminum, die steel, stainless steel, bronze, plastics. Titanium coating provides excellent corrosion resistance and wear resistance.

Twist Drill Bit: Spiral chip space design for fast and clean chip removal. Sharp cutting edge provides smooth cutting and no glitches. Cobalt high speed steel tool features high hardness (HRC65-66) and high red hardness, high wear resistance

Specification: Drill Bit Diameter: 9.5mm / 0.37-inch; Flute Length: 160mm / 6.3-inch; Shank Diameter: 9.5mm / 0.37-inch; Total Length: 250mm / 9.84-inch; 1 x Lengthened Drill Bits

High Speed Steel: Made of high-speed steel, with high hardness, heat resistance, wear resistance, durability and long service life.

Extended Drill：The jobber extended drill is suitable for a wide range of applications, allowing you to access hard-to-reach areas where ordinary drills cannot. High hardness, sharp twist drill bits will make drilling easier and more efficient.

Specification: Drill Bit Diameter: 12mm / 0.47-inch; Flute Length: 155mm / 6.1-inch; Shank Diameter: 12mm / 0.47-inch; Total Length: 250mm / 9.84-inch; 1 x Lengthened Drill Bits

High Speed Steel: Made of high-speed steel, with high hardness, heat resistance, wear resistance, durability and long service life.

Extended Drill：The jobber extended drill is suitable for a wide range of applications, allowing you to access hard-to-reach areas where ordinary drills cannot. High hardness, sharp twist drill bits will make drilling easier and more efficient.

5 Piece & 5 Sizes: 2mm, 2.5mm, 3mm, 4mm, 5mm

Extra-long Length: Provides better stability and balance during fast operation to ensure that the position is intact.

High-speed Steel Material: High strength, good toughness, and long service life.

Size: Bit Diameter: 3.1mm; Flute Length: 28mm / 1.1"; Total Length: 60mm / 2.4"; Shank Diameter: 3.1mm

Feature: After using full grinding process, it has stronger cutting ability and longer service life.

Material: Cobalt-containing high-speed steel drill bit, high wear resistance and toughness, not easy to break, sharp cutting edge, effectively improving drilling speed.

Specification: Drill Bit Diameter: 10mm / 0.39-inch; Flute Length: 126mm / 4.96-inch; Shank Diameter: 10mm / 0.39-inch; Total Length: 200mm / 7.87-inch; 1 x Lengthened Drill Bits

High Speed Steel: Made of high-speed steel, with high hardness, heat resistance, wear resistance, durability and long service life.

Extended Drill：The jobber extended drill is suitable for a wide range of applications, allowing you to access hard-to-reach areas where ordinary drills cannot. High hardness, sharp twist drill bits will make drilling easier and more efficient.

Specification: Drill Bit Diameter: 6.8mm / 0.27-inch; Flute Length: 120mm / 4.72-inch; Shank Diameter: 6.8mm / 0.27-inch; Total Length: 200mm / 7.87-inch; 1 x Lengthened Drill Bits

High Speed Steel: Made of high-speed steel, with high hardness, heat resistance, wear resistance, durability and long service life.

Extended Drill：The jobber extended drill is suitable for a wide range of applications, allowing you to access hard-to-reach areas where ordinary drills cannot. High hardness, sharp twist drill bits will make drilling easier and more efficient.

Specification: Drill Bit Diameter: 1mm / 0.04-inch, Flute Length: 70mm / 2.76-inch, Shank Diameter: 1mm / 0.04-inch, Total Length: 120mm / 4.72-inch; 20 x Mini Drill Bits

High Speed Steel: Made of high-speed steel, with high hardness, heat resistance, wear resistance, durability and long service life.

Extended Drill：The jobber extended drill is suitable for a wide range of applications, allowing you to access hard-to-reach areas where ordinary drills cannot. High hardness, sharp twist drill bits will make drilling easier and more efficient.

Features -- Total Size: 400x13mm/15.7 x 0.51-inch(L*Max. Dia.); Bit Type: 1/4''-Hexagon; Material: Metal.

Size -- Connection hex shank drill site size (6.35mm) (1/4) 0.25-inch; Connecting parts of the batch Hex size (6.35mm) (1/4) 0.25-inch.

Material -- This flexible shaft is made of carbon steel and plastic which make it practical and durable.

Tap and Drill Bit: Tap thread size: M5 x 0.8, drill bit diameter: 4.2mm / 0.17". High-speed steel tool has high hardness and toughness for wear resistance. Good for general purpose applications.

Spiral Flute Tap: Spiral flute design, upward chip removal, right hand thread cutting, fast tapping with accuracy. Suitable for processing blind holes and sticky materials, tapping aluminum, die steel, stainless steel, bronze, hard plastics.

Twist Drill Bit: Spiral chip space design for fast and clean chip removal. Sharp cutting edge provides smooth cutting and no glitches. Titanium coating provides excellent corrosion resistance and wear resistance.

[Specifications]- Twist Drill Bits Diameter: 3mm / 0.12-inch; Drill Bit Length: 73mm / 2.87-inch; Shank Diameter: 3mm / 0.12-inch; Total Length: 120mm / 4.72-inch; 1 x Parabolic Flute Drill Bit

[Strength and Hardness]- Made of M35 HSS(High Speed Steel) cobalt steel. With high hardness and red hardness, wear-resistant, and fast drilling performance.

[Surface Treatment]- The gold oxide surface treatment increases the hardness of the drill bit, provides longer drilling life and better drilling performance, and is more durable and corrosion resistant than uncoated drill bits.

Package Content: 1 Set x Hex Shank Twist Drill Bits(1.5, 2, 2.5, 3, 3.2, 3.5, 4, 4.5, 4.8, 5, 5.5, 6, 6.5mm, total of 13pcs)

Material: Twist Drill Bit Set made of High Speed Steel, high hardness, good wear resistance and durability

Surface Treatment: This High Speed Steel Drill Bits surface Titanium coated, which increase the hardness of the drill bit and reduces heat buildup, make the twist drill bit more wear-resisting for longer life

Tap and Drill Bit: Tap thread size: M2 x 0.4, drill bit diameter: 1.6mm / 0.06". High-speed steel tool has high hardness and toughness for wear resistance. Good for general purpose applications.

Spiral Flute Tap: Spiral flute design, upward chip removal, right hand thread cutting, fast tapping with accuracy. Suitable for processing blind holes and sticky materials, tapping aluminum, die steel, stainless steel, bronze, hard plastics.

Twist Drill Bit: Spiral chip space design for fast and clean chip removal. Sharp cutting edge provides smooth cutting and no glitches. Titanium coating provides excellent corrosion resistance and wear resistance.

Tap and Drill Bit: Tap thread size: 5/16-24 UNF, drill bit diameter: 6.9mm / 0.27". High-speed steel tool has high hardness and toughness for wear resistance.

Straight Flute Tap: Straight flute design, downward chip removal. Left hand thread cutting, fast tapping with accuracy. Suitable for processing through holes. For drilling and tapping aluminum, die steel, stainless steel, bronze, hard plastics

Twist Drill Bit: Spiral chip space design for fast and clean chip removal. Sharp cutting edge provides smooth cutting and no glitches. Titanium coating provides excellent corrosion resistance and improves wear resistance.

99pcs Drill Bits Include: 11pcs of each size( 1/16", 5/64", 3/32", 7/64", 1/8", 9/64", 5/35", 11/64", 3/16", 13/64", 7/32", 15/64", 1/4", 17/64", 9/32", 19/64", 5/16", 21/64", 11/32", 3/64", 3/8", 25/64", 13/32", 27/64", 19/32", 29/64", 15/64", 31/64", 1/2") drilling dia M35 straight round shank twist drills, can accommodate a wide range of drilling needs.

M35 Twist Drill Bit: Made from M35 cobalt material which has the characteristic of high hardness and durability. The cobalt material gives the bit superior wear resistance and overall toughness, making it great for long-term use in a variety of drilling applications.

Quick and Clean Drilling: The external point angle design of this cobalt twist drill bit allows for fast and efficient drilling, with effective chip removal to prevent clogging, perfect for a range of materials including metal, wood, and plastic.

13pcs Drill Bits Include: 1pcs of each size( 1/17", 7/89", 6/61", 11/93", 12/95", 4/29", 14/89", 14/79", 17/90", 13/66", 21/97", 17/72") drilling dia M35 straight hex shank twist drills, can accommodate a wide range of drilling needs.

M35 Twist Drill Bit: Made from M35 cobalt material which has the characteristic of high hardness and durability. The cobalt material gives the bit superior wear resistance and overall toughness, making it great for long-term use in a variety of drilling applications.

Quick and Clean Drilling: The external point angle design of this cobalt twist drill bit allows for fast and efficient drilling, with effective chip removal to prevent clogging, perfect for a range of materials including metal, wood, and plastic.

99pcs Drill Bits Include: 16pcs 1/17", 16pcs 7/89", 15pcs 6/61", 10pcs 11/93", 10pcs 12/95", 8pcs 14/99", 8pcs 14/89", 3pcs 4/79", 3pcs 13/66", 2pcs 21/97", 2pcs 17/72", 2pcs 11/43", 2pcs 23/73", 2pcs 37/94" drilling dia high-speed steel straight shank twist drills, can accommodate a wide range of drilling needs.

Titanium Coated Surface: Made of high-speed steel with titanium nitride coating which can increase the hardness of the twist drill and reduces friction between the bit and the material being drilled. Suitable for use in both handheld drills and drill presses.

High Hardness Drilling Performance: Suitable for hardened materials and hard metals, such as cast iron, malleable iron, aluminum, wood, plastic etc., and also suitable for soft materials. Great replacement for your dull drill bit to improve work efficiency.