21/64" Shank Size Drill Bits

Maintenance Length—Shorter than jobbers' length, these bits are more rigid for less wobble when drilling hard material. Also known as mechanics’ bits.

Extended Length—Drill through panels and thick workpieces with our longest bits. Their length is good for creating deep holes but makes them less rigid than other bits. As a result, they are more prone to wobbling or breaking, especially when drilling hard materials.

Black Oxide—The dark finish increases wear resistance and reduces friction to improve chip flow, so these bits can last 50% longer than uncoated bits.

Titanium Nitride (TiN) Coated—Drill at higher speeds and last longer than uncoated and oxide-coated bits, especially on tough materials like hardened steel and nickel.

Titanium Aluminum Nitride (TiAlN) Coated—The hardest and most wear-resistant coating, especially at high temperatures. These bits are best for hard and abrasive materials, such as iron and titanium.

Gold Oxide—Like black oxide, this finish adds wear resistance and reduces friction for improved chip flow. Because it’s less prone to flaking off, it offers better rust protection when bits aren't in use.

Uncoated—The most economical option, uncoated bits perform best when used on low-carbon steel and aluminum. Polished to reduce friction, they're also known as bright finish bits.

					Shank
	Drill Bit Size	Decimal Size Equiv.	Overall Lg.	Max. Drilling Dp.	Type	Size	Drill Bit Point Type	Pkg. Qty.		Pkg.
Jobbers' Length







				Black Oxide

				21/64"	0.3281"	4 5/8"	2.82"	Round	21/64"	Split	1	00000000	00000


				21/64"	0.3281"	4 5/8"	2.82"	Round	21/64"	Split	6	00000000	00000




						Titanium Nitride (TiN) Coated

						21/64"	0.3281"	4 5/8"	2.82"	Round	21/64"	Split	1	000000000	00000


						21/64"	0.3281"	4 5/8"	2.82"	Round	21/64"	Split	6	000000000	00000




								Titanium Aluminum Nitride (TiAlN) Coated

								21/64"	0.3281"	4 5/8"	2.82"	Round	21/64"	Split	1	0000000	00000




										Uncoated

										21/64"	0.3281"	4 5/8"	2.82"	Round	21/64"	Standard	1	0000000	0000


										21/64"	0.3281"	4 5/8"	2.82"	Round	21/64"	Standard	6	00000000	00000


										Short Length







														Black Oxide

														21/64"	0.3281"	3"	1.19"	Round	21/64"	Split	1	0000000	0000


														21/64"	0.3281"	3"	1.19"	Round	21/64"	Split	6	00000000	00000




																Titanium Nitride (TiN) Coated

																21/64"	0.3281"	3"	1.19"	Round	21/64"	Split	1	0000000	00000


21/64"	0.3281"															3"	1.19"	Round	21/64"	Split	3	0000000	00000




		Uncoated

		21/64"	0.3281"													3"	1.19"	Round	21/64"	Standard	1	00000000	0000


		Maintenance Length







																Gold Oxide

																21/64"	0.3281"	4 1/8"	2.48"	Round/3-Flat	21/64"	Split	1	00000000	0000


																21/64"	0.3281"	4 1/8"	2.48"	Round/3-Flat	21/64"	Split	6	00000000	00000


						Extended Length







								Black Oxide

								21/64"	0.3281"									6 1/2"	3.63"	Round	21/64"	Standard	1	000000000	00000


								21/64"	0.3281"									8"	5"	Round	21/64"	Standard	1	00000000	00000




																		Titanium Nitride (TiN) Coated

										21/64"								0.3281"	6 1/2"	4.13"	Round	21/64"	Standard	1	000000000	00000




												Uncoated

												21/64"	0.3281"					6 1/2"	4.13"	Round	21/64"	Standard	1	0000000	00000


												21/64"	0.3281"					12"	8.34"	Round	21/64"	Standard	1	0000000	00000
												21/64"	0.3281"					18"	12.34"	Round	21/64"	Standard	1	0000000	00000

Cobalt Steel Drill Bits

Jobbers' Length

Round Shank

Jobbers' Length

Hex Shank

Short Length

Round Shank

Extended Length

Round Shank

Split

Tough and wear resistant, cobalt steel bits last at least twice as long as high-speed steel. They can also run up to 25% faster at higher temperatures without being damaged on hard materials, such as nickel.

Jobbers' Length—These bits have the balance of rigidity and length needed for most applications.

Short Length—The most rigid bits for drilling the straightest holes.

Titanium Nitride (TiN) Coated—Drill at higher speeds and last longer than uncoated and oxide-coated bits, especially on tough materials like hardened steel and nickel.

Uncoated—Polished to eject chips, these are also known as bright finish bits.

					Shank			Each		Package
	Drill Bit Size	Decimal Size Equiv.	Overall Lg.	Max. Drilling Dp.	Type	Size	Drill Bit Point Type		Each	Pkg. Qty.		Pkg.
Jobbers' Length







				Titanium Nitride (TiN) Coated

				21/64"	0.3281"	4 5/8"	3.31"	Round	21/64"	Split	000000000	000000	—	———	0




						Titanium Aluminum Nitride (TiAlN) Coated

						21/64"	0.3281"	4 5/8"	2.46"	Round	21/64"	Split	00000000	00000	—	———	0




								Uncoated

								21/64"	0.3281"	4 5/8"	1.31"	Hex	21/64"	Split	0000000	00000	—	———	0


								21/64"	0.3281"	4 5/8"	2.8"	Round	21/64"	Split	0000000	00000	—	———	0


								Short Length







												Titanium Nitride (TiN) Coated

												21/64"	0.3281"	2 15/16"	1.19"	Round	21/64"	Split	0000000	00000	—	———	0




														Uncoated

														21/64"	0.3281"	3"	1.19"	Round	21/64"	Split	00000000	00000	6	000000000	000000


														Extended Length







																		Uncoated

																		21/64"	0.3281"	6 1/2"	3.46"	Round	21/64"	Split	00000000	00000	—	———	0

Carbide Drill Bits


Jobbers' Length Round Shank	Short Length Round Shank

The hardest and most wear-resistant drill bits you can buy. Carbide bits stay sharp at high temperatures and faster speeds for the best performance on hard and difficult-to-machine materials. They last 10 to 20 times longer than their closest alternative, cobalt steel. Carbide can be brittle, however, so these bits require a rigid machine tool holder to prevent breakage and should not be used in hand drilling applications.

Jobbers' Length—These bits have the balance of rigidity and length needed for most applications.

Short Length—The most rigid bits for drilling the straightest holes.

Titanium Nitride (TiN) Coated—Drill at higher speeds and last longer than uncoated bits, especially on materials like hardened steel, iron, and stainless steel.

Titanium Aluminum Nitride (TiAlN) Coated—No drill bits last longer. These are the best for high-speed, high-temperature drilling of very hard and abrasive materials, including titanium and fiberglass.

Uncoated—Excellent for a range of materials but won't last as long as coated bits.

					Shank
	Drill Bit Size	Decimal Size Equiv.	Overall Lg.	Max. Drilling Dp.	Type	Size	Drill Bit Point Type		Each
Jobbers' Length







				Titanium Nitride (TiN) Coated

				21/64"	0.3281"	4"	2"	Round	21/64"	Four Facet	00000000	000000




						Titanium Aluminum Nitride (TiAlN) Coated

						21/64"	0.3281"	4"	2"	Round	21/64"	Four Facet	0000000	00000




								Uncoated

								21/64"	0.3281"	4"	2"	Round	21/64"	Four Facet	0000000	00000


								Short Length







												Uncoated

												21/64"	0.3281"	2 3/4"	1"	Round	21/64"	Four Facet	0000000	00000

Chip-Clearing High-Speed Steel Drill Bits

Jobbers' Length

High Helix Flute

Round Shank

Jobbers' Length

Parabolic Flute

Round Shank

Extended Length

Parabolic Flute

Round Shank


Standard	Split

With flutes that lift chips out of the hole, you don't have to stop drilling to clear these bits manually. They improve coolant flow to dissipate heat and prevent clogs that can damage the bit and ruin the hole. High-speed steel is good for general purpose drilling in most metals.

High Helix Flute—Less aggressive than parabolic flutes for cleaner cuts in soft metals.

Parabolic Flute—A U-shaped groove on the flutes cuts faster and clears chips more quickly than high-helix bits, so these are better for drilling deeper holes.

Jobbers' Length—These bits have the balance of rigidity and length needed for most applications.

Black Oxide—The dark finish increases wear resistance and reduces friction to improve chip flow, so these bits can last 50% longer than uncoated bits.

Titanium Nitride (TiN) Coated—Drill at higher speeds and last longer than uncoated and oxide-coated bits, especially on tough materials like hardened steel and nickel.

Uncoated—The most economical option, uncoated bits perform best when used on low-carbon steel and aluminum. Polished to reduce friction, they're also known as bright finish bits.

						Shank
	Drill Bit Size	Decimal Size Equiv.	Overall Lg.	Max. Drilling Dp.	Flute Type	Type	Size	Drill Bit Point Type		Each
Jobbers' Length







				Black Oxide

				21/64"	0.3281"	4 5/8"	2.28"	High Helix	Round	21/64"	Split	00000000	000000


				21/64"	0.3281"	4 5/8"	2.65"	Parabolic	Round	21/64"	Split	00000000	00000




						Titanium Nitride (TiN) Coated

						21/64"	0.3281"	4 5/8"	2.65"	Parabolic	Round	21/64"	Split	00000000	00000




								Uncoated

								21/64"	0.3281"	4 5/8"	2.65"	Parabolic	Round	21/64"	Split	0000000	00000


								21/64"	0.3281"	4 5/8"	2.82"	High Helix	Round	21/64"	Standard	00000000	0000


								Extended Length







												Uncoated

												21/64"	0.3281"	8"	5.34"	Parabolic	Round	21/64"	Split	00000000	00000


												21/64"	0.3281"	12"	8.34"	Parabolic	Round	21/64"	Split	00000000	00000

Carbide-Tipped Drill Bits

Jobbers' Length

Round Shank


Standard	Split

Performance similar to solid carbide but at a lower price point. Like carbide bits, these are stronger than cobalt and high-speed steel and maintain their sharp edges when drilling abrasive material. However, when drilling tough metals like iron and hardened steel, upgrade to carbide for longer life.

Jobbers' Length—These bits have the balance of rigidity and length needed for most applications.

					Shank
	Drill Bit Size	Decimal Size Equiv.	Overall Lg.	Max. Drilling Dp.	Type	Size	Drill Bit Point Type		Each
Jobbers' Length







				Uncoated

				21/64"	0.3281"	4 5/8"	2.8"	Round	21/64"	Standard	0000000	000000


				21/64"	0.3281"	4 5/8"	2.8"	Round	21/64"	Split	00000000	00000

Short-Flute High-Speed Steel Drill Bits

Extended Length

Round Shank

Split

The rigidity of short-length bits without sacrificing reach. The shallow drilling depth makes these less likely to wobble than other bits of the same length, so they stay centered and drill straighter. High-speed steel is good for general purpose drilling in most metals.

Extended Length—Drill through panels and thick workpieces with our longest bits.

Black Oxide—The dark finish increases wear resistance and reduces friction to improve chip flow, so these bits can last 50% longer than uncoated bits.

					Shank
	Drill Bit Size	Decimal Size Equiv.	Overall Lg.	Max. Drilling Dp.	Type	Size	Drill Bit Point Type		Each
Extended Length







				Black Oxide

				21/64"	0.3281"	6"	2.8"	Round	21/64"	Split	0000000	000000


				21/64"	0.3281"	12"	2.8"	Round	21/64"	Split	0000000	00000

Carbide Drill Bits for Carbon Fiber, Fiberglass, and Graphite

Jobbers' Length

Cut clean holes in abrasive material without fraying or delaminating the surface. Made of carbide, these bits resist wear to retain a sharp edge, even after after hundreds of cuts.

					Shank
	Drill Bit Size	Decimal Size Equiv.	Overall Lg.	Max. Drilling Dp.	Type	Size	Point Angle	Drill Bit Point Type	Bit Style		Each
Jobbers' Length







				Uncoated

				21/64"	0.3281"	4"	2"	Round	21/64"	140°	Brad	Fluted	0000000	000000

High-Speed Steel Drill Bits for Plastic

The precision-ground, 60° point penetrates gradually to prevent cracking and chipping. It also reduces heat that can deform the material. Use these bits for drilling into acrylic, laminate, and other plastics. They're made of wear-resistant high-speed steel.

Jobbers' Length About Jobbers' Length

					Shank
	Drill Bit Size	Decimal Size Equiv.	Overall Lg.	Max. Drilling Dp.	Type	Size	Point Angle	Drill Bit Point Type		Each
Uncoated



		21/64"	0.3281"	4 5/8"	3.31"	Round	21/64"	60°	Standard	00000000	000000

Short-Flute Carbide-Tipped Drill Bits

Extended Length

Round Shank

Split

Our strongest short-flute bits, these have a carbide tip that stays sharp when drilling abrasive materials, such as titanium. The shallow drilling depth makes them less likely to wobble than other bits of the same length, so they stay centered and drill straighter.

Extended Length—Drill through panels and thick workpieces with our longest bits.

					Shank
	Drill Bit Size	Decimal Size Equiv.	Overall Lg.	Max. Drilling Dp.	Type	Size	Drill Bit Point Type		Each
Extended Length







				Uncoated

				21/64"	0.3281"	6"	3.31"	Round	21/64"	Split	0000000	000000


				21/64"	0.3281"	12"	2.78"	Round	21/64"	Split	0000000	00000

Left-Hand High-Speed Steel Drill Bits

Jobbers' Length

Round Shank

Standard

With flutes that spiral in the opposite direction of other bits, these are primarily used to remove stripped screws. Choose a bit that’s slightly smaller than the diameter of the screw’s head. Set your power tool to rotate in reverse. Slowly drill in the center of the screw head, maintaining constant pressure. As the bit penetrates, it will catch onto the screw and reverse it out of the hole. If the screw is badly stripped, you might need to punch a starter hole. Also known as reverse-flute bits. High-speed steel is the versatile choice for drilling most metals.

Jobbers' Length—These bits have the balance of rigidity and length needed for most applications.

Uncoated—The most economical option, uncoated bits perform best when used on low-carbon steel and aluminum. Polished to reduce friction, they're also known as bright finish bits.

					Shank				Each
	Drill Bit Size	Decimal Size Equiv.	Overall Lg.	Max. Drilling Dp.	Type	Size	Drill Bit Point Type		1-5	6-Up
Jobbers' Length







				Uncoated

				21/64"	0.3281"	4 5/8"	2.65"	Round	21/64"	Standard	0000000	000000	000000

Carbide-Tipped Drill Bits for Hardened Steel

Jobbers' Length

Round Shank

Straight flutes withstand the heavy pressure needed to penetrate hardened steel. These bits cut more aggressively and resist stress better than spiral-flute bits. A lower-priced alternative to solid carbide, they stay sharp when drilling abrasive material but won’t last as long.

Jobbers' Length—These bits have the balance of rigidity and length needed for most applications.

					Shank
	Drill Bit Size	Decimal Size Equiv.	Overall Lg.	Max. Drilling Dp.	Type	Size	Drill Bit Point Type		Each
Jobbers' Length







				Uncoated

				21/64"	0.3281"	4 3/4"	1.31"	Round	21/64"	Notched	0000000	000000

Chip-Clearing Cobalt Steel Drill Bits

Jobbers' Length

Parabolic Flute

Round Shank

Split

Avoid clogs and dissipate heat with cobalt bits that last at least twice as long as high-speed steel. The flutes clear chips to improve coolant flow and prevent damage to the bit and the hole. They also speed up drilling since you don't have to stop to clear the bit manually.

Jobbers' Length—These bits have the balance of rigidity and length needed for most applications.

Titanium Nitride (TiN) Coated—Drill at higher speeds and last longer than uncoated and oxide-coated bits, especially on tough materials like hardened steel and nickel.

Uncoated—Polished to eject chips, these are also known as bright finish bits.

						Shank
	Drill Bit Size	Decimal Size Equiv.	Overall Lg.	Max. Drilling Dp.	Flute Type	Type	Size	Drill Bit Point Type		Each
Jobbers' Length







				Titanium Nitride (TiN) Coated

				21/64"	0.3281"	4 1/2"	2.8"	Parabolic	Round	21/64"	Split	0000000	000000




						Uncoated

						21/64"	0.3281"	4 1/2"	2.8"	Parabolic	Round	21/64"	Split	000000000	00000

Short-Flute Cobalt Steel Drill Bits

Jobbers' Length

Round Shank

Split

These bits combine the toughness and wear resistance of cobalt with short flutes for rigidity. The shallow drilling depth makes them less likely to wobble than other bits of the same length, so they stay centered and drill straighter. Cobalt lasts at least twice as long as high-speed steel. It can also run up to 25% faster at higher temperatures without damaging the bit on hard materials such as nickel.

Jobbers' Length—These bits have the balance of rigidity and length needed for most applications.

Black Oxide—The dark finish increases wear resistance and reduces friction to improve chip flow, so these bits can last 50% longer than uncoated bits.

					Shank				Each
	Drill Bit Size	Decimal Size Equiv.	Overall Lg.	Max. Drilling Dp.	Type	Size	Drill Bit Point Type		1-4	5-Up
Jobbers' Length







				Black Oxide

				21/64"	0.3281"	4 5/8"	1.2"	Round	21/64"	Split	00000000	000000	000000

Chip-Clearing High-Speed Steel Drill Bits for Aluminum, Brass, and Bronze

Jobbers' Length

Low Helix Flute

Round Shank

Standard

Designed for soft metals that can gum up other drill bits, wide flutes lift chips out of the hole. This prevents clogs that can weaken and damage the bit and ruin the hole. Also known as slow spiral bits, these are made of versatile high-speed steel.

Jobbers' Length—These bits have the balance of rigidity and length needed for most applications.

Uncoated—The most economical option, uncoated bits perform best when used on low-carbon steel and aluminum. Polished to reduce friction, they're also known as bright finish bits.

						Shank				Each
	Drill Bit Size	Decimal Size Equiv.	Overall Lg.	Max. Drilling Dp.	Flute Type	Type	Size	Drill Bit Point Type		1-5	6-Up
Jobbers' Length







				Uncoated

				21/64"	0.3281"	4 5/8"	2.65"	Low Helix	Round	21/64"	Standard	00000000	000000	000000