AMC 2026 catalogue

Power Tools

Step Drill Bits

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POWER TOOLS

Step Drill Bits

Spiral flute, straight flute, 3-flat, hex, and spade bits.

WSW6EXN4

No. of Hole Sizes Shank Size Step Thickness Size Range Overall Length Brand

Item

No. Cobalt

12 3⁄8 in 1⁄16 in 3⁄16 in to 7⁄8 in 3 1⁄4 in Irwin Unibit IRW10234CB Cobalt Alloy Steel

8 1⁄2 in 1⁄8 in 9⁄16 in to 1 in 3 in Irwin Unibit IRW10220CB 13 1⁄4 in 1⁄32 in 1⁄8 in to 1⁄2 in 3 1⁄8 in Irwin Unibit IRW10231CB High Speed Steel

1 1⁄4 in — 1⁄2 in 1 3⁄4 in Peterson PTR10 1 3⁄8 in — 7⁄8 in 2 in Peterson PTR11 1 3⁄8 in 1⁄8 in 7⁄8 in to 1 1⁄8 in 2 13⁄64 in Milwaukee MTL48-89-9207 1 7⁄16 in — 1 1⁄8 in 2 7⁄8 in Irwin Unibit IRW10313ZR 2 1⁄4 in 5⁄32 in 3⁄8 in to 1⁄2 in 2 1⁄32 in Milwaukee MTL48-89-9206 2 1⁄4 in 5⁄32 in 7⁄8 in to 1 1⁄8 in 3 13⁄32 in DeWalt BLDDWA1789IR 2 3⁄8 in 1⁄8 in 7⁄8 in to 1 1⁄8 in 2 61⁄64 in Milwaukee MTL48-89-9209 2 3⁄8 in 1⁄8 in 7⁄8 in to 1 1⁄8 in 2 3⁄4 in LENOX LNX30888 3 3⁄8 in 1⁄8 in 7⁄8 in to 1 7⁄32 in 3 3⁄64 in Milwaukee MTL48-89-9211 4 3⁄8 in 1⁄16 in 3⁄16 in to 7⁄8 in — Clarkson-Osborn CSBDR70004 5 3⁄8 in 1⁄16 in 7⁄8 in to 1 3⁄8 in 3 1⁄4 in Westward WSW19N141 5 3⁄8 in 3⁄16 in 7⁄8 in to 1 3⁄8 in 3 1⁄16 in Milwaukee MTL48-89-9212 5 1⁄2 in 1⁄8 in 1⁄4 in to 1 3⁄8 in — Clarkson-Osborn CSBDR70005 6 1⁄4 in 1⁄16 in 3⁄16 in to 1⁄2 in — Clarkson-Osborn CSBDR70002 6 1⁄4 in 3⁄8 in 3⁄16 in to 1⁄2 in 3 1⁄2 in DeWalt BLDDWA1784IR 6 1⁄4 in 1⁄16 in 3⁄16 in to 1⁄2 in 3 1⁄8 in Peterson PTR2 6 1⁄4 in 3⁄8 in 3⁄16 in to 1⁄2 in 3 5⁄64 in Milwaukee MTL48-89-9202 8 7⁄16 in 1⁄8 in 9⁄16 in to 1 in 3 in Peterson PTR20 9 1⁄4 in 1 mm 1⁄8 in to 7⁄8 in 1 in Milwaukee MTL48-89-9254 9 1⁄4 in 1 mm 1⁄8 in to 1 in 1 in Milwaukee MTL48-89-9256 9 1⁄4 in 1⁄16 in 1⁄4 in to 3⁄4 in — Clarkson-Osborn CSBDR70003 9 1⁄4 in 1⁄16 in 1⁄4 in to 3⁄4 in 2 3⁄4 in Peterson PTR3 9 3⁄8 in 1⁄16 in 1⁄4 in to 3⁄4 in 2 3⁄4 in Westward WSW19N124 9 3⁄8 in 5⁄32 in 1⁄4 in to 3⁄4 in 2 37⁄64 in Milwaukee MTL48-89-9203 9 3⁄8 in 1⁄16 in 1⁄2 in to 1 in 3 1⁄4 in Westward WSW19N142 9 3⁄8 in 3⁄16 in 1⁄2 in to 1 in 3 17⁄64 in Milwaukee MTL48-89-9208 10 3⁄8 in 3⁄16 in 1⁄4 in to 1 3⁄8 in 3 3⁄64 in Milwaukee MTL48-89-9205 10 7⁄16 in 1⁄8 in 1⁄4 in to 1 3⁄8 in 3 1⁄8 in Irwin Unibit IRW10235 12 1⁄4 in 5⁄32 in 3⁄16 in to 7⁄8 in — DeWalt BLDDWA1786IR 12 3⁄8 in 3⁄16 in 3⁄16 in to 7⁄8 in — LENOX LNX30908 12 3⁄8 in 5⁄32 in 3⁄16 in to 7⁄8 in 2 61⁄64 in Milwaukee MTL48-89-9204 12 3⁄8 in 1⁄16 in 3⁄16 in to 7⁄8 in 3 1⁄4 in Peterson PTR4 12 3⁄8 in 1⁄16 in 3⁄16 in to 7⁄8 in 3 1⁄4 in Westward WSW19N127 13 1⁄4 in 1⁄32 in 1⁄8 in to 1⁄2 in — Clarkson-Osborn CSBDR70001 13 1⁄4 in 5⁄32 in 1⁄8 in to 1⁄2 in 3 13⁄32 in DeWalt BLDDWA1783IR 13 1⁄4 in 1⁄32 in 1⁄8 in to 1⁄2 in 3 1⁄8 in Peterson PTR1 13 1⁄4 in 1⁄32 in 1⁄8 in to 1⁄2 in 3 1⁄8 in Irwin Unibit PTR15101 13 1⁄4 in 5⁄32 in 1⁄8 in to 1⁄2 in 3 7⁄64 in Milwaukee MTL48-89-9201 16 1⁄4 in 1 mm 1⁄8 in to 1 1⁄8 in 1 in Milwaukee MTL48-89-9257 28 1⁄4 in x 3⁄8 in 1⁄32 in, 1⁄16 in, 1⁄4 in 1⁄8 in to 1 3⁄8 in 2 3⁄4 in, 3 in, 3 1⁄8 in LENOX LNX30929

28 3⁄8 in 1⁄8 in, 1⁄8 in, 3⁄8 in 1⁄2 in to 1 1⁄8 in, 1⁄8 in to 1⁄2 in, 3⁄16 in to 7⁄8 in 3 in to 3 3⁄8 in Westward WSW6EXN2

31 1⁄4 in 5⁄32 in, 3⁄8 in 1⁄8 in to 7⁄8 in 3 13⁄32 in, 3 1⁄2 in DeWalt BLDDWA1790IR 31 1⁄4 in, 3⁄8 in 5⁄32 in, 3⁄8 in 1⁄8 in to 7⁄8 in 3 in, 3 1⁄64 in, 3 7⁄64 in Milwaukee MTL48-89-9221

31 3⁄8 in 3⁄16 in, 5⁄32 in, 3⁄8 in 1⁄8 in to 1 3⁄8 in 2 13⁄64 in, 3 in, 3 7⁄64 in, 3 7⁄64 in Milwaukee MTL48-89-9223

38 1⁄4 in, 3⁄8 in 1⁄8 in, 5⁄32 in, 3⁄16 in 1⁄8 in to 1 1⁄8 in 2 1⁄32 in, 2 13⁄64 in, 2 61⁄64 in, 3 7⁄64 in, 3 in, 3 21⁄64 in Milwaukee MTL48-89-9224

CLARKSON-OSBORN, DEWALT, IRWIN UNIBIT, LENOX, MILWAUKEE, PETERSON, WESTWARD

Size Range Step Thickness No. of Hole Sizes

Item

No. 3⁄16 in to 7⁄8 in 1⁄8 in 12 WSW6EXN4 1⁄8 in to 1⁄2 in 1⁄8 in 13 WSW6EXN3 1⁄4 in to 1 3⁄8 in 1⁄8 in 10 WSW6EXN5 1⁄2 in to 1 1⁄8 in 3⁄8 in 3 WSW6EXN6

BLDDWA1783IR