Traditional high security Yale Nightlatch approved to British Standard BS 8621:2007 and Police Secure by Design. Automatic deadlock locks when closing the door for instant security, and the latch can be held back temporarily with the snib button. Features a high security TS007 1 star Rim Cylinder with reinforced exterior for anti-drill protection and components designed to resist known attack methods. The internal nightlatch handle can be locked from the inside with a key, making it ideal for use with wooden doors with glazed panels. Supplied with 2 standard Yale keys and a fixing pack for easy installation. Includes anti-card slip protection, which prevents your lock from being vulnerable to this technique that only requires a card sized piece of plastic. Weight: 2.20462262 Pounds.