Keyless chuck for use on mains powered, cordless drills and drill drivers. Quick and easy to use, this chuck can be operated by hand for fast bit changes The all steel construction provides a long working life making this chuck ideal for use on professional hammer drills The chuck also features a non-slip locking system for impact drilling and holesaw applications 1/2in x 20 UNF thread. Comes complete with SDS Adaptor to convert 1/2in x 20 UNF thread to SDS+