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    58 Products
    About Drill Bits
    industrial info icon

    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
    Each
    Jobbers' Length
    Image of Product. Side1 orientation. Drill Bits. Left-Hand Cobalt Steel Drill Bits, Jobbers' Length, Round Shank.

    Round Shank

    Image of Specification. Split. Front orientation. Contains Border. Split Point. For Metal.

    Split

     
    Uncoated
    1.5 mm
    		0.0591"
    		48 mm22 mmRound
    		1.5 mmSplit
    		000000000000
    2.0 mm
    		0.0787"
    		51 mm25 mmRound
    		2 mmSplit
    		00000000000
    2.5 mm
    		0.0984"
    		60 mm35 mmRound
    		2.5 mmSplit
    		00000000000
    3.0 mm
    		0.1181"
    		70 mm41 mmRound
    		3 mmSplit
    		00000000000
    3.5 mm
    		0.1378"
    		73 mm45 mmRound
    		3.5 mmSplit
    		00000000000
    4.0 mm
    		0.1575"
    		83 mm54 mmRound
    		4 mmSplit
    		000000000000
    4.5 mm
    		0.1772"
    		86 mm56 mmRound
    		4.5 mmSplit
    		000000000000
    5.0 mm
    		0.1968"
    		92 mm62 mmRound
    		5 mmSplit
    		000000000000
    5.5 mm
    		0.2165"
    		95 mm64 mmRound
    		5.5 mmSplit
    		000000000000
    6.0 mm
    		0.2362"
    		102 mm70 mmRound
    		6 mmSplit
    		000000000000
    6.5 mm
    		0.2559"
    		105 mm73 mmRound
    		6.5 mmSplit
    		000000000000
    7.0 mm
    		0.2756"
    		105 mm73 mmRound
    		7 mmSplit
    		000000000000
    7.5 mm
    		0.2953"
    		111 mm78 mmRound
    		7.5 mmSplit
    		000000000000
    8.0 mm
    		0.315"
    		114 mm81 mmRound
    		8 mmSplit
    		000000000000
    8.5 mm
    		0.3346"
    		121 mm87 mmRound
    		8.5 mmSplit
    		000000000000
    9.0 mm
    		0.3543"
    		124 mm89 mmRound
    		9 mmSplit
    		000000000000
    9.5 mm
    		0.374"
    		127 mm92 mmRound
    		9.5 mmSplit
    		000000000000
    10.0 mm0.3937"
    		130 mm95 mmRound
    		10 mmSplit
    		000000000000
    10.5 mm
    		0.4134"
    		133 mm98 mmRound
    		10.5 mmSplit
    		000000000000
    11.0 mm
    		0.4331"
    		140 mm103 mmRound
    		11 mmSplit
    		000000000000
    11.5 mm
    		0.4528"
    		143 mm106 mmRound
    		11.5 mmSplit
    		000000000000
    12.0 mm
    		0.4724"
    		149 mm111 mmRound
    		12 mmSplit
    		000000000000
    12.5 mm
    		0.4921"
    		152 mm114 mmRound
    		12.5 mmSplit
    		000000000000
    13.0 mm
    		0.5118"
    		152 mm114 mmRound
    		13 mmSplit
    		000000000000
     
    Maintenance Length
    Image of Product. Side1 orientation. Drill Bits. Left-Hand Cobalt Steel Drill Bits, Maintenance Length, Round Shank.

    Round Shank

    Image of Specification. Split. Front orientation. Contains Border. Split Point. For Metal.

    Split

     
    Titanium Nitride (TiN) Coated
    5/64"
    		0.0781"
    		2"0.88"Round
    		5/64"Split
    		00000000000
    7/64"
    		0.1094"
    		2 1/4"0.84"Round
    		7/64"Split
    		00000000000
    1/8"
    		0.125"
    		2 1/4"1.06"Round
    		1/8"Split
    		00000000000
    5/32"
    		0.1563"
    		2 5/8"1.27"Round
    		5/32"Split
    		00000000000
    3/16"
    		0.1875"
    		2 7/8"1.34"Round
    		3/16"Split
    		00000000000
    7/32"
    		0.2188"
    		3 1/8"1.42"Round
    		7/32"Split
    		00000000000
    1/4"
    		0.25"
    		3 3/8"1.63"Round
    		1/4"Split
    		00000000000
    5/16"
    		0.3125"
    		3 3/4"1.97"Round
    		5/16"Split
    		000000000000
    3/8"
    		0.375"
    		4 1/8"2.06"Round
    		3/8"Split
    		000000000000
     
    Titanium Aluminum Nitride (TiAlN) Coated
    5/64"
    		0.0781"
    		2"0.88"Round
    		5/64"Split
    		00000000000
    7/64"
    		0.1094"
    		2 1/4"0.84"Round
    		7/64"Split
    		00000000000
    1/8"
    		0.125"
    		2 1/4"1.06"Round
    		1/8"Split
    		00000000000
    5/32"
    		0.1563"
    		2 5/8"1.27"Round
    		5/32"Split
    		00000000000
    3/16"
    		0.1875"
    		2 7/8"1.34"Round
    		3/16"Split
    		00000000000
    7/32"
    		0.2188"
    		3 1/4"1.42"Round
    		7/32"Split
    		000000000000
    1/4"
    		0.25"
    		3 3/8"1.63"Round
    		1/4"Split
    		000000000000
    5/16"
    		0.3125"
    		3 3/4"1.97"Round
    		5/16"Split
    		000000000000
    3/8"
    		0.375"
    		4 1/8"2.06"Round
    		3/8"Split
    		000000000000
     
    Uncoated
    5/64"
    		0.0781"
    		2"0.88"Round
    		5/64"Split
    		00000000000
    7/64"
    		0.1094"
    		2 1/4"0.84"Round
    		7/64"Split
    		00000000000
    1/8"
    		0.125"
    		2 1/4"1.06"Round
    		1/8"Split
    		00000000000
    5/32"
    		0.1563"
    		2 5/8"1.27"Round
    		5/32"Split
    		00000000000
    3/16"
    		0.1875"
    		2 7/8"1.34"Round
    		3/16"Split
    		00000000000
    7/32"
    		0.2188"
    		3 1/8"1.42"Round
    		7/32"Split
    		00000000000
    1/4"
    		0.25"
    		3 3/8"1.63"Round
    		1/4"Split
    		00000000000
    9/32"
    		0.2813"
    		3 5/8"1.7"Round
    		9/32"Split
    		00000000000
    19/64"
    		0.2969"
    		3 5/8"1.87"Round
    		19/64"Split
    		000000000000
    5/16"
    		0.3125"
    		3 3/4"1.97"Round
    		5/16"Split
    		000000000000
    11/32"
    		0.3438"
    		4"1.98"Round
    		11/32"Split
    		000000000000
    3/8"
    		0.375"
    		4 1/8"2.06"Round
    		3/8"Split
    		000000000000
    13/32"
    		0.4063"
    		4 3/8"2.14"Round
    		13/32"Split
    		000000000000
    7/16"
    		0.4375"
    		4 5/8"2.22"Round
    		7/16"Split
    		000000000000
    15/32"
    		0.4688"
    		4 3/4"2.23"Round
    		15/32"Split
    		000000000000
    1/2"
    		0.5"
    		5"2.31"Round
    		1/2"Split
    		000000000000
     
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