General description This 6Pc HSS Step Cone Drill Bit Set is designed for precision and efficiency. Made from high-quality HSS steel and coated with titanium, these drill bits minimize friction and heat, making them ideal for cutting holes in various materials such as steel, brass, wood, and plastic. Technical specifications Material: HSS steel with titanium coating Size: 10 * 1 * 1 cm Package Contents: 2 * Cloth Bag, 2 * 4-12mm Countersink Drill, 2 * 4-20mm Countersink Drill, 2 * 4-32mm Countersink Drill Measurement allowed error: +/- 1-3 cm