General description Step Cone Drill Bit with 13 steps ranging from 5mm to 35mm is designed for precision drilling in various materials including steel, brass, plastic, wood, copper, fiberglass, PVC, thin metal, and aluminum. The classic HSS construction ensures stability and speed, while the special titanium coating reduces friction and heat, enhancing durability and accuracy during drilling. Technical specifications Type: 5-35mm (5, 7, 10, 12, 15, 17, 20, 22, 25, 27, 30, 32, 35mm) Total Length: 72mm Height of each step: 3mm Shank Diameter: 12.7mm Shank Length: 24mm Material: HSS-4241 Weight: 30g Usage Recommended drilling speed: 250-400rpm Suitable for materials with hardness under HRC 25° For optimal performance, use water to cool the bit while drilling, especially on plates less than 5mm thick. Other information Caution: Always protect your hands when using this tool. This product is not intended for sale to children.