Selftightening mechanism: Keyless drill chuck with an automatic selftightening design that provides a secure, speed grip on tools during CNC, lathe, or milling operations, delivering stable performance and reliable engagement. Comprehensive compatibility: Designed for general use with bench drills, radial drills, and drilling machines. A longlasting steel collet chuck suitable for holding woodworking drills and milling cutters, with a clamping range from 0.5 mm to 20 mm depending on the B10 to B22 models. performance material: Made from grade steel to withstand daily use, resisting premature wear and ensuring a long service life with dependable, consistent gripping. Precise clamping range by model: B10 clamps 0.5–6 mm; B12 clamps 1–10 mm; B16 clamps 1–16 mm; B18 clamps 1–16 mm; B22 clamps 5–20 mm, providing options for your specific drilling and milling needs. Use scenarios: CNC milling or lathe work requiring a secure, fast tool grip on smalldiameter drills (using B10 or B12). Woodworking drilling or light milling on bench or radial drills, selecting the model to cover 0.5–20 mm tooling. Repeated setup and quick changes on milling machines or CNC setups, ensuring reliable grip over extended runs.