Quick-clamping chuck, three-jaw, quality materials and precise processing, Click lock system - clamping with lock against release, clamping range for tools 1.5 – 13 mm, Clamping 1/2 – 20 UNF, use: drills, impact drills, cordless drills, cordless impact drills, cordless screwdrivers, for quick manual clamping (tightening) of the working tool, (can be combined with adapter 20745 for attaching the chuck to machines with a head with SDS + clamping), packaging plastic box with euro hole.