Irwin Model 10232, Step Drill Bit, 3/16" To 1/2", Six Steps
Speed point tip provides faster initial penetration time and eliminates the need for center punching. Single-fluted cutting edge assures true round holes and allows greater control with less vibration. For drilling holes in thin materials such as mild steel, copper, brass, aluminum, plexiglass, wood and laminates. 6 steps, each step 1/16"
HIGH SPEED STEEL - SPEED POINT - FRACTIONAL SELF-STARTING