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 applications1/2in x 20 UNF thread.Heavy-duty all steel constructionJaw locking system for hammer use