Yale 84 Deadbolt Night Latch 60mm Backset Polished Brass is a door lock that is operated from either side of the door. The night latches that have a classic styling is incorporated with a deadlocking snib function. The back set measures 40mm (from the edge of the door to the centre of the keyhole). The case is dark metallic grey finished and the cylinder has a polished brass finish. Anti-bump feature of the locks, work by having more pins and specially made keys, having shallow pin stacks to prevent it from jumping up. Snib function enable the latch to be held back. Latch can be deadlocked by the snib button internally. Snib function enable the latch to be held back.