Irwin 10231 1 13 Hole Sizes (1/8"-1/2"), 1/32" Increments.

Irwin Unibit (#10231). High Speed Steel Fractional Self-Starting. Single-flute cutting edge for greater control through steps. 3 flatted shank prevents slipping in drill chuck. Also available with titanium nitride coating for longer life. SpeedPoint tip penetrates faster than previous Unibits and prevents walking. Ideal for drilling holes into thin materials such as stainless steel, copper, brass, aluminum, plastic and laminates. Description: Drills 1/8" - 1/2" in 13 Steps. Made In China to IRWIN Specifications.

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