OHZ4700 Features: * 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 * 3 flatted shank prevents slipping in drill chuck * New SpeedPoint tip penetrates faster than previous Unibits and prevents walking * 12 steps * 3/16"" - 7/8"" Titanium Fractional Self Starting Unibit Step Drill Warranty: * Lifetime warranty does not cover abuse