Irwin 10312ZR 12 3/8IN - SINGLE HOLE

10312ZR Unibit® High Speed Steel Fractional Self-Starting Step Drill - No.12 3/8" (Single Hole). 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.12. Hole Sizes: 3/8" (single hole). Number of Holes: 1 step. Hex Shank Size: 1/4".