Quick-release chuck, three-jaw, quality materials and precise processing, clamping range for tools 2 – 13 mm, Clamping 1/2 – 20 UNF, use: drills, hammer drills, cordless drills, cordless hammer 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.