Case Depth: 70 mm Cover Height: 86 mm Cylinder Backset: 40 mm features: SDS British Standard High Security Nightlatch now gives customers an even wider range to choose from It complies with BS3621: 2004 and falls in line with the new European Standard (BS EN 12209) This product is ideally suited to glass panelled wooden doors. Its designed with an internal lockable handle, offering added security against forced entry Operation is by key from the outside and by a handle from the inside The main lock bolt is automatically deadlocked when the door is closed, preventing the main bolt being retracted by a credit card The inside handle can be deadlocked by an anti-clockwise turn of the key from the inside so securing the lock against forced entry The bolt can be held in the withdrawn position (only) with the use of the snib feature c/w 3 keys and security cylinder pull