General description This Yale P85 Nightlatch Security Lock is a deadlocking mechanism designed for 40 mm door entrances, providing enhanced security and ease of use for both residential and commercial doors. It features a polished chrome finish and is one of the most widely-used front door latches. Technical specifications Body finish: Polished Chrome Backset (latch length): 16 mm Overall height: 68 mm Width: 60 mm Maximum door thickness: 60 mm Type: Deadlocking nightlatch Security Rating: High Compatibility and accessories Designed for standard 40 mm door preparations Compatible with various door types that accommodate a 40 mm latch Installation Easy to install on compatible doors with standard 40 mm backset Requires basic tools for fitting Usage Provides secure locking with a deadlocking feature for added safety Suitable for residential and commercial doors requiring reliable security Key operated from the outside and lever handle operated from the inside The latch automatically