Step Drill Bits Metric 10-30mm are designed for drilling larger diameter holes from 10mm to 30mm with precision and efficiency. High-speed steel or coated construction ensures long-lasting sharpness and durability during repetitive operations. Step geometry allows sequential multi-diameter drilling without changing tools, while tapered or straight shanks provide secure mounting in drill presses, CNC machines, or hand drills. Spiral flutes aid chip removal and reduce heat buildup. Ideal for industrial fabrication, prototyping labs, and professional workshop environments.