The Yale PBS1 BS3621: 2007 High Security Nightlatch offers robust security with automatic deadlocking upon closing the door. Operated by key from outside and key or lever handle from inside, the internal handle can be locked for added control. The dark red snib feature allows the latch to be held back as needed. Designed for doors up to 57mm thick, it features a 60mm backset, 87mm case width, 90mm case height, and a 20mm bolt length. Kitemarked to BS 3621:2007 with a 6-pin cylinder and supplied with two keys, this durable nightlatch ensures reliable high-security performance.