- Step Drill Bit: Crafted from 4241HSS high-speed steel, this reamer bit offers superior sharpness and durability compared to standard steel options. - Trapezoidal Design: Features ten segments capable of drilling holes from 4 mm to 22 mm in diameter, including sizes 4, 6, 8, 10, 12, 14, 16, 18, 20, and 22 mm. - Versatile Applications: Ideal for drilling and reaming through a variety of materials such as wood, resin, plastic, iron, copper, and aluminum, making it a crucial tool for any DIY project or professional job. - Adjustable Reamer: The multi-stage design allows for easy selection of diameters, enabling you to create both small and large holes as needed. Achieve precise hole sizes for various applications effortlessly. Use Scenarios: 1. Perfect for woodworking projects where precise hole diameters are essential for fittings or joining materials. 2. Great for metalworking tasks that require drilling through various metals like aluminum and copper for fabrication. 3. An excellent choice for plumbing or electrical installations, where accurate holes are necessary for pipes and wiring. This step drill bit combines high-quality material, versatile functionality, and user-friendly design to enhance your drilling tasks efficiently.