High hardness and durability Made from quality materials, this drill chuck and collet set provides high hardness, long life, and reliable performance. Compatible with most rotary tools Designed for use with electric grinders and compatible with a wide range of rotary tools, including hardware, hobby tools, and more. Wide clamping range Includes copper collets in multiple sizes to cover a broad diameter range, with clamping ranges from 3 mm to 3.2 mm for versatile project needs. Applications - Fine drilling of small holes in wood, plastic, or soft metals for hobby projects or DIY tasks. - Precision work on electronics enclosures, model making, or small hardware assemblies requiring a secure grip on small bits or burrs. - Upgrading or maintaining power tools in home workshops where a reliable, compatible chuck set is needed.