0.159" Shank Size Drill 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.

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	Mfr.		Each
Jobbers' Length







				Black Oxide

				21 Ga.	0.159"	3 1/4"	1.88"	Round	0.159"	Split	Chicago-Latrobe	2901A194	00000




						Titanium Nitride (TiN) Coated

						21 Ga.	0.159"	3 1/4"	1.88"	Round	0.159"	Split	Chicago-Latrobe	29045A743	0000




								Titanium Aluminum Nitride (TiAlN) Coated

								21 Ga.	0.159"	3 1/4"	1.88"	Round	0.159"	Split	Chicago-Latrobe	3178A481	0000




										Uncoated

										21 Ga.	0.159"	3 1/4"	1.88"	Round	0.159"	Standard	Viking Norseman Drill	30585A33	0000


										Short Length







														Black Oxide

														21 Ga.	0.159"	2 1/8"	0.82"	Round	0.159"	Split	Chicago-Latrobe	2896A533	0000




																Titanium Nitride (TiN) Coated

																21 Ga.	0.159"	2 1/8"	1.13"	Round	0.159"	Split	Chicago-Latrobe	3584A161	0000




																		Uncoated

																		21 Ga.	0.159"	2 1/8"	1.13"	Round	0.159"	Standard	Chicago-Latrobe	8947A173	0000


																		Extended Length







																				Black Oxide

		21 Ga.	0.159"																	5 3/4"	3.13"	Round	0.159"	Standard	Chicago-Latrobe	3096A333	00000




																				Titanium Nitride (TiN) Coated

				21 Ga.	0.159"															5 3/4"	3.38"	Round	0.159"	Standard	Dormer Pramet	28965A835	00000

Cobalt Steel Drill Bits

Jobbers' Length

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







				Titanium Nitride (TiN) Coated

				21 Ga.	0.159"	3 1/4"	2.13"	Round	0.159"	Split	Dormer Pramet	27995A633	00000




						Uncoated

						21 Ga.	0.159"	3 1/4"	1.88"	Round	0.159"	Split	Chicago-Latrobe	3033A233	0000


						Short Length







										Titanium Nitride (TiN) Coated

										21 Ga.	0.159"	2 1/8"	0.63"	Round	0.159"	Split	Dormer Pramet	28765A954	0000




												Uncoated

												21 Ga.	0.159"	2 1/8"	0.8"	Round	0.159"	Split	Chicago-Latrobe	28765A71	0000


												Extended Length







																Uncoated

																21 Ga.	0.159"	5 3/4"	3.1"	Round	0.159"	Split	Dormer Pramet	88555A49	00000

Carbide Drill Bits

Jobbers' 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.

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	Mfr.		Each
Jobbers' Length







				Titanium Nitride (TiN) Coated

				21 Ga.	0.159"	2 1/2"	1.1"	Round	0.159"	Four Facet	Ultra Tool	8825A382	000000




						Titanium Aluminum Nitride (TiAlN) Coated

						21 Ga.	0.159"	2 1/2"	1.1"	Round	0.159"	Four Facet	Ultra Tool	8879A53	00000




								Uncoated

								21 Ga.	0.159"	2 1/2"	1.1"	Round	0.159"	Four Facet	Ultra Tool	2860A33	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	Mfr.		Each
Extended Length







				Black Oxide

				21 Ga.	0.159"	6"	1.88"	Round	0.159"	Split	Chicago-Latrobe	3161A33	00000


				21 Ga.	0.159"	12"	1.88"	Round	0.159"	Split	Chicago-Latrobe	3158A133	00000

Carbide-Tipped Drill Bits

Jobbers' Length

Round Shank


Split	Standard

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	Mfr.		Each
Jobbers' Length







				Uncoated

				21 Ga.	0.159"	3 1/4"	1.65"	Round	0.159"	Standard	ICS	2940A423	000000


				21 Ga.	0.159"	3 1/4"	1.9"	Round	0.159"	Split	ICS	31575A433	00000

Carbide Drill Bits for Hardened Steel


Short Length Round Shank	Split

The hardest and most wear-resistant bits with the longest life. Straight flutes withstand the heavy pressure needed to penetrate hardened steel. These bits cut more aggressively and resist stress better than spiral-flute bits. Carbide stays sharp at high temperatures and faster speeds for the best performance on hard and difficult-to-machine materials. It 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.

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.

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	Mfr.		Each
Short Length







				Titanium Nitride (TiN) Coated

				21 Ga.	0.159"	2 1/2"	0.6"	Round	0.159"	Split	Ultra Tool	8882A592	000000




						Uncoated

						21 Ga.	0.159"	2 1/2"	0.6"	Round	0.159"	Four Facet	Ultra Tool	8944A6	00000

Short-Flute Cobalt Steel Drill Bits

Jobbers' Length

Round Shank

Extended 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.

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.

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.	Type	Size	Drill Bit Point Type	Mfr.		Each
Jobbers' Length







				Black Oxide

				21 Ga.	0.159"	3 1/4"	0.82"	Round	0.159"	Split	Cleveland	3146A195	00000


				Extended Length







								Uncoated

								21 Ga.	0.159"	6"	1.8"	Round	0.159"	Split	Dormer Pramet	8952A162	0000

Chip-Clearing High-Speed Steel Drill Bits

Jobbers' Length

High Helix Flute

Round Shank

Jobbers' Length

Parabolic Flute

Round Shank


Split	Standard

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	Mfr.		Each
Jobbers' Length







				Black Oxide

				21 Ga.	0.159"	3 1/4"	1.8"	Parabolic	Round	0.159"	Split	Chicago-Latrobe	27575A43	00000




						Titanium Nitride (TiN) Coated

						21 Ga.	0.159"	3 1/4"	1.8"	Parabolic	Round	0.159"	Split	Chicago-Latrobe	29925A966	0000




								Uncoated

								21 Ga.	0.159"	3 1/4"	1.8"	Parabolic	Round	0.159"	Split	Dormer Pramet	2761A231	0000


								21 Ga.	0.159"	3 1/4"	1.88"	High Helix	Round	0.159"	Standard	Chicago-Latrobe	2912A194	0000

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.

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	Mfr.		Each
Jobbers' Length







				Uncoated

				21 Ga.	0.159"	3"	1.56"	Parabolic	Round	0.159"	Split	Viking Norseman Drill	28555A43	00000

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	Mfr.		Each
Uncoated



		21 Ga.	0.159"	3 1/4"	1.37"	Round	0.159"	60°	Standard	ICS	27465A333	00000

Hole-Starting Carbide Drill Bits


Short Length Round Shank	Split

Harder and more wear resistant than cobalt steel, these carbide bits create an accurate starting place in your workpiece. Cut an indent, then continue drilling with a longer bit. The indent prevents slipping so the final hole is centered and precise. Carbide stays sharp at high temperatures and faster speeds. It 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.

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.

					Shank				140° Point Angle
	Drill Bit Size	Decimal Size Equiv.	Overall Lg.	Max. Drilling Dp.	Type	Size	Drill Bit Point Type	Mfr.		Each
Short Length







				Titanium Nitride (TiN) Coated

				21 Ga.	0.159"	2 1/4"	0.48"	Round	0.159"	Split	GWS	88915A353	0000000

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	Mfr.		Each
Extended Length







				Uncoated

				21 Ga.	0.159"	12"	1.6"	Round	0.159"	Split	ICS	2854A443	000000

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	Mfr.		Each
Jobbers' Length







				Uncoated

				21 Ga.	0.159"	2 1/2"	1.1"	Round	0.159"	140°	Brad	Fluted	Ultra Tool	2828A878	000000

Smooth-Finish Carbide Drill Bits


Jobbers' Length Round Shank	Split

With more cutting edges than other drill bits, these cut continuously and consistently for a smoother finish. They also stay centered to produce holes that are straighter and more accurate. However, since there’s less space between the cutting edges, they don’t clear chips as quickly. Made of carbide, these are the hardest and most wear-resistant drill bits you can buy. They stay sharp at high temperatures and faster speeds for the best performance on hard and difficult-to-machine materials. 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.

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	Mfr.		Each
Jobbers' Length







				Uncoated

				21 Ga.	0.159"	2 1/2"	1.1"	Round	0.159"	Split	Ultra Tool	3171A79	000000

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	Mfr.		1-11	12-Up
Jobbers' Length







				Uncoated

				21 Ga.	0.159"	3 1/4"	1.8"	Round	0.159"	Standard	Chicago-Latrobe	3024A243	00000	00000

Extensions for Round-Shank Drill Bits

Two-Piece Extensions

Attach to the shank of a drill bit to extend its reach.

Two-Piece Extensions—To attach two-piece extensions, insert a drill bit into the collet, then thread the collet onto the extension and tighten with a wrench.

	For Drill Bit
	Size	Size Decimal Equiv.	Shank Size	Shank Size	Overall Lg.	OD	Material		Each
For Wire Gauge Drill Bits







				Two-Piece Extensions

				21 Ga.	0.1590"	0.159"	1/4"	4 1/2"	5/16"	Steel	3016A822	000000


				21 Ga.	0.1590"	0.159"	1/4"	9 1/2"	5/16"	Steel	3016A848	00000