Step Drill Bits Metric 4-12mm are designed for versatility and precision in creating holes ranging from 4mm to 12mm in metals, plastics, and wood. Constructed from high-speed steel or coated options, they resist wear and maintain sharp edges for repeated use. Step geometry allows drilling multiple diameters sequentially without changing tools, while tapered or straight shanks ensure secure mounting in drill presses, CNC machines, or hand drills. Spiral flutes improve chip removal and reduce heat, making them ideal for fabrication workshops, prototyping labs, and DIY projects.