This replacement brass collet provides a big improvement in and holds these tiny bits far more securely and in better alignment with the rotation of the tool Clamping Diameter: 0.5 / 0.8 / 1.0 / 1.2 / 1.5 / 1.8 / 2.0 / 2.4 / 3.0 / 3.2mm for most rotary tools used in hardware, hobby, home brass collets to For, other rotary tools, pin vises Under high-speed rotation, it not only maintains stability but also improves work efficiency, Manufacturer: Beimus