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Irwin
Constructed of M-2 high-speed steel for the best combination of strength, heat-resistance, and wear-resistance. For use in wood, metal, and plastic.
Diablo Step Drill Bit, 1-1/8-In.
Diablo Step Drill Bit, 1-3/8-In.
Diablo 3/8 In. - 7/8 In. Impact Step Drill Bit, 12 Steps
Diablo 1/4 In. - 1/2 In. Impact Step Drill Bit, 6 Steps
Diablo 1/4 In. - 1/2 In. Impact Step Drill Bit, 13 Steps