Irwin 10310 IRWIN Unibit High-Speed Steel Fractional Self-Starting Step Drill Bit, No.10 (10310)

Unibit10, -1/2-Inch Single Hole Size Ideal for drilling holes into thin materials such as stainless steel, copper, brass, aluminum, plastic and laminates. Single-flute cutting edge for greater control through steps. Patented single-flute cutting edge gives the user a true round hole every time. 3 faltted shank prevents slipping in drill chuck. New speedpoint tip penetrates faster than previous unibits and prevents walking.