LAIWEI step drill 4-32MM Trapezoid drill: 15 segments 4mm-32mm (4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32) LAIWEI hexagonal shaft step drill, titanium-plated surface with storage bag, each section has millimeter scale display 1. Surface treatment: The titanium coating is made of 4241HSS high-speed steel, which is stronger, sharper and more durable than ordinary steel tower drills. 2. Taper drill allows you to freely choose the diameter of the reamer hole, from small holes to large holes, you can get holes of various sizes. 3. The LAIWEI trapezoidal drill adopts a hexagonal shaft design, which is suitable for tools such as impact drill, electric drill, cordless electric drill (the cordless electric drill uses a voltage above 12V). 4: Used for punching and reamer processing of wood, resin and plastic sheets. Thin iron, copper, aluminum and other materials with a thickness of 1-2 mm. Step drills have a wide range of uses, from home DIY to field work. What LAIWEI can do for you  7x24 customer service. Unconditional returns within 30 days.