Irwin 10231 IRWIN Unibit High-Speed Steel Fractional Self-Starting Step Drill Bit, No.1 (10231)

10231. Unibit® High Speed Steel Fractional Self-Starting Step Drill. No.1 1/8" - 1/2" (1/32" steps) - Carded. Standard Features: Single-flute cutting edge for greater control through steps. Hex shank prevents slipping in drill chuck. Also available with (TiN) coating for longer life. Ideal for drilling holes into thin materials such as stainless steel, copper, brass, aluminum, plastic and laminates. Description: No.1. Hole Sizes: 1/8" - 1/2" (1/32" Increments). Number of Holes: 13 steps. Hex Shank Size: 1/4".