The traditional night latch is a lock that is fitted on the surface of a door and is operated internally by a knob and externally with a key. - Just pulling the door closed engages the latch. - Brass cylinder with two keys. - A form of cylinder rim lock. - Pick / Tamper resistant - Full fitting instructions are enclosed. The Narrow 60mm Traditional Night latch is designed to help provide extra security and peace of mind. With key operation from the outside, as well as a durable knob-handle from the inside, this easy-to-install 40mm night latch even comes complete with 3 keys and all the necessary fitting essentials.