Cobalt Steel Left Hand Drill Bits

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Titanium Aluminum Nitride (TiAlN) Coated

Titanium Nitride (TiN) Coated

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Bit Style

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Number of Flutes

Manufacturer

Cle-Line

Viking Norseman Drill

Point Angle

135°

Shank Type

Round

U.S.–Mexico–Canada Agreement (USMCA) Qualifying

Yes

DFARS Specialty Metals

Exempt

Export Control Classification Number (ECCN)

EAR99

Maximum Drilling Depth

REACH

RoHS

Certification

58 Products

About Drill Bits

Compare material, finish, length class, and decimal size equivalents.

Left-Hand Cobalt Steel Drill Bits

The flutes spiral in the opposite direction of other bits and stay sharp longer than high-speed steel. They’re 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.

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

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

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
Round Shank Split






				Uncoated

				1.5 mm	0.0591"	48 mm	22 mm	Round	1.5 mm	Split	Viking Norseman Drill	3474A48	00000


				2.0 mm	0.0787"	51 mm	25 mm	Round	2 mm	Split	Viking Norseman Drill	3474A49	00000
				2.5 mm	0.0984"	60 mm	35 mm	Round	2.5 mm	Split	Viking Norseman Drill	3474A51	00000
				3.0 mm	0.1181"	70 mm	41 mm	Round	3 mm	Split	Viking Norseman Drill	3474A52	00000
				3.5 mm	0.1378"	73 mm	45 mm	Round	3.5 mm	Split	Viking Norseman Drill	3474A53	00000
				4.0 mm	0.1575"	83 mm	54 mm	Round	4 mm	Split	Viking Norseman Drill	3474A54	00000
				4.5 mm	0.1772"	86 mm	56 mm	Round	4.5 mm	Split	Viking Norseman Drill	3474A55	00000
				5.0 mm	0.1968"	92 mm	62 mm	Round	5 mm	Split	Viking Norseman Drill	3474A56	00000
				5.5 mm	0.2165"	95 mm	64 mm	Round	5.5 mm	Split	Viking Norseman Drill	3474A57	00000
				6.0 mm	0.2362"	102 mm	70 mm	Round	6 mm	Split	Viking Norseman Drill	3474A58	00000
				6.5 mm	0.2559"	105 mm	73 mm	Round	6.5 mm	Split	Viking Norseman Drill	3474A59	00000


				7.0 mm	0.2756"	105 mm	73 mm	Round	7 mm	Split	Viking Norseman Drill	3474A61	00000
				7.5 mm	0.2953"	111 mm	78 mm	Round	7.5 mm	Split	Viking Norseman Drill	3474A62	00000
				8.0 mm	0.315"	114 mm	81 mm	Round	8 mm	Split	Viking Norseman Drill	3474A63	00000
				8.5 mm	0.3346"	121 mm	87 mm	Round	8.5 mm	Split	Viking Norseman Drill	3474A64	00000
				9.0 mm	0.3543"	124 mm	89 mm	Round	9 mm	Split	Viking Norseman Drill	3474A65	00000
				9.5 mm	0.374"	127 mm	92 mm	Round	9.5 mm	Split	Viking Norseman Drill	3474A66	00000
				10.0 mm	0.3937"	130 mm	95 mm	Round	10 mm	Split	Viking Norseman Drill	3474A67	00000
				10.5 mm	0.4134"	133 mm	98 mm	Round	10.5 mm	Split	Viking Norseman Drill	3474A68	00000
				11.0 mm	0.4331"	140 mm	103 mm	Round	11 mm	Split	Viking Norseman Drill	3474A69	00000
				11.5 mm	0.4528"	143 mm	106 mm	Round	11.5 mm	Split	Viking Norseman Drill	3474A71	00000


				12.0 mm	0.4724"	149 mm	111 mm	Round	12 mm	Split	Viking Norseman Drill	3474A72	00000
				12.5 mm	0.4921"	152 mm	114 mm	Round	12.5 mm	Split	Viking Norseman Drill	3474A73	00000
				13.0 mm	0.5118"	152 mm	114 mm	Round	13 mm	Split	Viking Norseman Drill	3474A74	00000


				Maintenance Length
				Round Shank Split






								Titanium Nitride (TiN) Coated

								5/64"	0.0781"	2"	0.88"	Round	5/64"	Split	Cle-Line	3474A28	0000


								7/64"	0.1094"	2 1/4"	0.84"	Round	7/64"	Split	Cle-Line	3474A29	0000
								1/8"	0.125"	2 1/4"	1.06"	Round	1/8"	Split	Cle-Line	3474A31	0000
								5/32"	0.1563"	2 5/8"	1.27"	Round	5/32"	Split	Cle-Line	3474A32	0000
								3/16"	0.1875"	2 7/8"	1.34"	Round	3/16"	Split	Cle-Line	3474A33	0000
								7/32"	0.2188"	3 1/8"	1.42"	Round	7/32"	Split	Cle-Line	3474A34	0000
								1/4"	0.25"	3 3/8"	1.63"	Round	1/4"	Split	Cle-Line	3474A35	00000
								5/16"	0.3125"	3 3/4"	1.97"	Round	5/16"	Split	Cle-Line	3474A36	00000
								3/8"	0.375"	4 1/8"	2.06"	Round	3/8"	Split	Cle-Line	3474A37	00000




								Titanium Aluminum Nitride (TiAlN) Coated

								5/64"	0.0781"	2"	0.88"	Round	5/64"	Split	Cle-Line	3474A38	0000


		7/64"	0.1094"					2 1/4"	0.84"	Round	7/64"	Split	Cle-Line	3474A39	0000
		1/8"	0.125"					2 1/4"	1.06"	Round	1/8"	Split	Cle-Line	3474A41	0000
		5/32"	0.1563"					2 5/8"	1.27"	Round	5/32"	Split	Cle-Line	3474A42	0000
		3/16"	0.1875"					2 7/8"	1.34"	Round	3/16"	Split	Cle-Line	3474A43	0000
		7/32"	0.2188"					3 1/4"	1.42"	Round	7/32"	Split	Cle-Line	3474A44	00000
		1/4"	0.25"					3 3/8"	1.63"	Round	1/4"	Split	Cle-Line	3474A45	00000
		5/16"	0.3125"					3 3/4"	1.97"	Round	5/16"	Split	Cle-Line	3474A46	00000
		3/8"	0.375"					4 1/8"	2.06"	Round	3/8"	Split	Cle-Line	3474A47	00000




								Uncoated

								5/64"	0.0781"	2"	0.88"	Round	5/64"	Split	Cle-Line	3474A11	0000


								7/64"	0.1094"	2 1/4"	0.84"	Round	7/64"	Split	Cle-Line	3474A12	0000
								1/8"	0.125"	2 1/4"	1.06"	Round	1/8"	Split	Cle-Line	3474A13	0000
								5/32"	0.1563"	2 5/8"	1.27"	Round	5/32"	Split	Cle-Line	3474A14	0000
								3/16"	0.1875"	2 7/8"	1.34"	Round	3/16"	Split	Cle-Line	3474A15	0000
								7/32"	0.2188"	3 1/8"	1.42"	Round	7/32"	Split	Cle-Line	3474A16	0000
								1/4"	0.25"	3 1/2"	1.63"	Round	1/4"	Split	Cle-Line	3474A17	0000
								9/32"	0.2813"	3 5/8"	1.7"	Round	9/32"	Split	Cle-Line	3474A18	00000
								19/64"	0.2969"	3 5/8"	1.87"	Round	19/64"	Split	Cle-Line	3474A19	00000
								5/16"	0.3125"	3 3/4"	1.97"	Round	5/16"	Split	Cle-Line	3474A21	00000
								11/32"	0.3438"	4"	1.98"	Round	11/32"	Split	Cle-Line	3474A22	00000


								3/8"	0.375"	4 1/8"	2.06"	Round	3/8"	Split	Cle-Line	3474A23	00000
								13/32"	0.4063"	4 3/8"	2.14"	Round	13/32"	Split	Cle-Line	3474A24	00000
								7/16"	0.4375"	4 5/8"	2.22"	Round	7/16"	Split	Cle-Line	3474A25	00000
								15/32"	0.4688"	4 3/4"	2.23"	Round	15/32"	Split	Cle-Line	3474A26	00000
								1/2"	0.5"	5"	2.31"	Round	1/2"	Split	Cle-Line	3474A27	00000