Step Drill Bits Metric 6-20mm provide precision and durability for creating holes from 6mm to 20mm in metals, plastics, and wood. Made from high-speed steel or coated materials, these step drills maintain sharp edges and resist wear during continuous operations. Step geometry allows multiple diameters to be drilled sequentially with a single tool, while tapered or straight shanks ensure secure installation in drill presses, hand drills, or CNC machines. Spiral flutes improve chip removal and reduce heat buildup. Ideal for industrial fabrication, workshops, and prototyping labs.