Irwin Tools IRWIN Unibit Drill Bit, Single Hole Size, 1/2-Inch (10310)
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.