The ERA BS 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, featuring automatic deadlocking and double locking. It is available in a narrow 40mm backset and standard 60mm backset. The automatic deadlocking mechanism prevents the extended bolt from being retracted by a credit card. The product comes with a 10-year manufacturer's mechanical guarantee and is available in satin nickel, brass, polished chrome, and satin chrome finishes. The integral cylinder pull protects the cylinder from drilling, and it features a 20mm bolt throw for increased security and strength. The cylinder has over 30,000 cut key variations. It is ideally suited for glass panelled wooden doors, with an ergonomic internal lockable handle offering added security against forced entry. The inside handle can be deadlocked by an anti-clockwise turn of the key from the inside. The bolt can also be held in the withdrawn position using the snib feature. This nightlatch conforms to British Standard 3621:2004 (BS EN 12209), meeting the tough criteria laid down by insurance companies and police.