The ERA British Standard High Security Nightlatch provides maximum security to replace most existing front door locks. It complies with BS 3621 Licence No. 07029 and offers a maximum security rating. This nightlatch is suitable for wood and glass panelled doors. It features automatic deadlocking, which prevents the extended bolt being retracted by a credit card, and double locking. Available in standard (60mm) and narrow (40mm) backsets, and satin nickel, brass, polished chrome and satin chrome finishes. The product comes with a 10 year manufacturer's mechanical guarantee.