Step Drill Bits Inch 1/2-1 are engineered for accurate, efficient drilling of multiple hole diameters ranging from 1/2 inch to 1 inch. Constructed from high-speed steel or coated variants, these step drills maintain sharp cutting edges and resist wear during continuous operations. The step geometry allows sequential drilling of multiple diameters without changing tools, while tapered or straight shanks ensure secure installation in drill presses, CNC machines, or hand drills. Spiral flutes improve chip removal and reduce heat buildup. Ideal for industrial fabrication, prototyping, and professional workshops.