OHZ4710 Features: * 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 * Ideal for drilling holes into thin materials such as stainless steel, copper, brass, aluminum, plastic and laminates * Hole size: 1/8" - 1/2", number of holes: 13 steps * #1 Titanium Fractional Self Starting Step Unibit Drill Bit Warranty: * Lifetime warranty does not cover abuse