by Irwin
Buy new:
4 used & new from $45.33
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Irwin Unibit Cobalt is made of high speed steel, this step drill bit will last longer in the toughest of materials. Irwin Industrial Tools 10220CB 20 8 Hole Sizes (9/16-Inch-1-Inch), 1/16-Inch Increments - Hole Enlarging
6X longer life. 3-Flatted shank. Speedpoint tip. Laser marked sizes.

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