Union Cl-Sl-Qe30-Cy-Ss Narrow Stile Hook Lock,

Designed for narrow stile applications: This means it's suitable for doors with thin frames, such as aluminum or UPVC doors, where a standard mortise lock might not fit. Hook lock mechanism: It features a hook-shaped bolt that engages with a strike plate on the door frame, providing enhanced security against forced entry. Part of the ASSA ABLOY group: The packaging visible in the image indicates the lock is from Union, which is a brand under the larger ASSA ABLOY group, known for its expertise in door opening solutions.