The spiral design angle of the cutter body is , which is convenient and fast, and the cutting and punching are smoother. High-quality high-speed steel, precision manufacturing, good toughness, strong wear resistance, and no burr when punching. Hexagon screws have high self-locking hardness. High strength, wear resistance, burr-free cutting and safety. Hexagonal handle design, smooth bottom, not easy to rub with the machine, easy to work. It is suitable for operation on hand drills, bench drills and row drills, and is suitable for solid boards, compression boards, density boards and plastic boards. It is forbidden to use stainless steel, aluminum alloy, copper, glass, ceramics and other materials. Name: woodworking hole opener set Colour:black+silver Material:high speed steel Package Contents: 1 x Woodworking hole opener set Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.