General description Step Cone Drill Bit features a range of 13 steps from 5 mm to 35 mm, designed for drilling through various materials including steel, brass, plastic, wood, copper, fiberglass, PVC, thin metals, and aluminum. The drill bit is made from HSS-4241 with a titanium coating that enhances durability and reduces friction and heat during use. Technical specifications Type: 5-35 mm (5, 7, 10, 12, 15, 17, 20, 22, 25, 27, 30, 32, 35 mm) Total length: 72 mm Height of each step: 3 mm Shank diameter: 12.7 mm Shank length: 24 mm Material: HSS-4241 Weight: 30 g Usage Recommended drilling speed: 250 to 400 rpm Suitable for workpieces with a hardness below HRC 25° Ideal for plate thickness of less than 5 mm Water cooling during operation can effectively extend the service life Other information Note: Remember to protect your hands when using This product is not intended for sale to children