General description The 6-60mm HSS Step Drill Bit is designed for precision drilling with a range of 12 steps, making it versatile for various applications. It features a tapered slotted countersink design, ideal for creating clean holes in different materials. Technical specifications Step drill size: 6-60mm (12 steps: 6, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60mm) Shank diameter: 13 mm Material: HSS 4241 Recommended drill speed: 250-400 RPM Maximum workpiece hardness: less than 25° Maximum workpiece thickness: under 5mm Usage Suitable for drilling into carbon steel, sheets, insulation boards, PVC panels, boards, and wood Use water cooling while drilling to extend the life of the drill