ASEC Kite BS3621 Deadlocking NightlatchThe ASEC Kite BS3621 Deadlocking Nightlatch is a high security lock designed for use on solid or glass panelled timber doors, providing addiitonal security against forced entry. Features Over 30,000 differs The bolt can be held in the withdrawn position with the use of the snib Supplied with fixings and keep Automatically deadlocks in the closed position Ideal for use with inward opening wooden doors Available in various finishes and sizes below.