Poplock quick release extension bar provides access & locks socket in security position when working in restricted areas. Poplock locking mechanism allows the socket to be locked to the extension preventing annoying and possibly damaging loss of the socket, particularly important when working in areas of restricted access. Quick release allows quick & easy change of socket. 1/4"" Drive with 11mm Hex drive; length: 18inches (450mm). Complies with DIN standards. Manufactured from chrome vanadium with matt finish.