Usage Tips:10 sizes of high quality brass collets (0.5mm, 0.8mm, 1.0mm, 1.2mm, 1.5mm, 1.8mm, 2.0mm, 2.4mm, 3.0mm, 3.2mm), M8 long-tailed universal collet, 2pc metric stock nut, electric motorized wrench, L-driver. Brass collets hold bits and other accessories securely in place, making it easy to replace damaged rotary tool accessories without having to change the top collet. Built-in spring ensures better retention, preventing accessories from falling or flying out of place during use and providing excellent stability. The keyless chuck holds a wide range of accessories from 1/32-inch to 1/8-inch shank sizes. Brass collet, made of high quality brass, is wear- and ruggedness, not easy to break, and can hold fine drill bits more firmly. It not only maintains stability when rotating at high speed, but also improves working efficiency. Metal nut, made of alloy steel, is wear-, ruggedness and than plastic nut. Used in conjunction with brass collets, it provides excellent adaptability and higher accuracy for precision work. Our drill chuck sleeves are compatible with for rotary tools and are ideal for accessories such as drills, sanding drums, buffing wheels, wire brushes, and cutting wheels. Colour:As Shown Material:Metal Package Contents: 1 set * for collet 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.