Irwin Industrial Tools 10233 Unibit #3 HSS 9-Step Drill Bit (1/4" to 3/4")

This step drill bit features a single-flute cutting edge for greater control through steps. The 3 flatted shank prevents slipping in drill chuck.

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This step drill bit features a single-flute cutting edge for greater control through steps. The 3 flatted shank prevents slipping in drill chuck.