Description: 【Premium Material】Countersink Bits are made of alloy with high hardness, sharp and wear resistant, and can be used for a long time. 【Function】Taper bits are practical tool specially used for drilling holes in wooden boards.Used with limiter, it can drill holes quickly and has adjustable height. Suitable for composite boards, plastic boards, density boards, solid boards and other types of wood. 【Package List】You will receive 5 Spiral Bits, 1x limiter, 1x wrench 【Woodworking Bits】Easy to use, easy to install, drill holes accurately and effortlessly. 【Quality】Adjustable Bits, Professional manufacturing, stable performance, and long service life. Specification: Material:  Alloy Size Chart: 2.8mmx8mm/0.11inchx0.31inch 3.0mmx8mm/0.12inchx0.31inch 3.2mmx8mm/0.13inchx0.31inch 3.5mmx8mm/0.14inchx0.31inch 4.0mmx8mm/0.16inchx0.31inch Package Includes: 5x Countersink Bits 1x limiter 1x wrench Note: Please allow slightly errors 1-2cm differences due to manual measurement.