General description The HSS step drill features a large spiral cone design, consisting of 12 step drill bits with diameters ranging from 6 mm to 60 mm. This versatile tool is ideal for drilling through various materials, including metal, wood, aluminum alloys, plastic panels, and insulation boards. Its unique enlargement holes eliminate the need to replace the drill bit and positioning hole during use. Technical specifications Material: HSS 4241 high-speed steel with titanium coating Diameter range: 6 mm, 10 mm, 15 mm, 20 mm, 25 mm, 30 mm, 35 mm, 40 mm, 45 mm, 50 mm, 55 mm, 60 mm Recommended drilling speed: 250–400 rpm Rust-proof, wear-resistant, and heat-resistant Installation Three-sided shank fits securely into the power tool chuck to prevent slipping Usage Suitable for workpieces with a hardness of less than 25° Surface depth gauges ensure precise drilling Designed for efficient chip removal with a 135 split point and 2-flute double-cut design Other information Scope of delivery: