Irwin Drill Bit, Step / Unibit, 1 Hole Size, 0.250" Shank, 0.500" Hole Diameter (#10)

This IRWIN Unibit #10 High-Speed Steel Fractional Self-Starting Step Drill Bit features a single-flute cutting edge for greater control through each of its 2 steps. The hex shank helps prevent slipping in a drill chuck. Use this reliable drill bit to drill holes into thin materials like stainless-steel, copper and more.