Step Drill Bits Inch 3/8-3/4 are designed to drill holes ranging from 3/8 inch to 3/4 inch with precision in metals, plastics, and wood. High-speed steel or coated materials ensure wear resistance and long-lasting sharpness during repeated use. Step geometry allows sequential drilling of multiple diameters with a single tool, while tapered or straight shanks ensure secure mounting in drill presses, hand drills, or CNC machines. Spiral flutes improve chip removal and heat dissipation, making them ideal for industrial fabrication, workshops, and prototyping labs.