Ultra Hardware 840046 Brass Rim Single Cylinder Deadlocking Spring Latch Night Latch Slam Lock, Die cast brass construction. Give yourself peace of mind at night with this exclusive deadlock slam lock latch and angle strike bracket. This secure, single-cylinder latch includes the lock body (turn knob inside) and 5-Pin tumbler locking cylinder (key outside), the angle strike bracket and 2 keys. Surface installation requires no mortising. The latch is automatically locked with a spring latch for security, but the latch hold-back stop button will keep the latch in the unlocked or open position in order to prevent locking oneself out. Surface latch-bolt designed for doors 1-3/8" to 2-1/2" thick. Requires 1-1/4" diameter hole. Furnished with angle strike bracket, Y1 keyway.