General description The HSS Twist Drill Bit Multi-Hole Cutter is designed for precision drilling in various materials. With a size range of 6mm to 60mm (0.24 to 2.36 inches) and 12 step sizes, this high-speed steel step drill bit is perfect for enlarging holes in sheet metal, PVC, and wood. Technical specifications Material: HSS4241 High Speed Steel Hole Size: 6-60mm / 0.24 - 2.36 inches Shank Diameter: 13mm / 0.51 inches Drill Head Length: 82mm Step Sizes: 6, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60mm (12 steps) Usage Suitable for workpieces with hardness below 25, including carbon steel, sheet iron, insulation boards, PVC boards, planks, and wood with thickness below 5mm.