London Line from Ingersoll is designed for "ultimate security" and to exceed British Standard BS3621:2004. The rim nightlatch features a patented safety kick off feature with slam auto-deadlocking. The rim lock cylinder system that is mounted through the door incorporates the Mul-T-Lock interactive patented cylinder system. Security features include a large robust strike, security estutcheon and 20mm bolt throw. London Line nightlatches are suitable as an upgrade for most standard rim locks and are available in an anti-tarnish, anti-scratch chrome or brass finish. Use with Ingersoll London Line mortice lock.