Lock case LC121

Double cylinder lock case with an automatically deadlocking latchbolt. The deadlocking can be controlled by a snib in the frontplate. When the snib is in its up position, the lock can be opened by the key or the thumbturn. When the snib is in its down position, the door can also be opened by the handles. The lock case works with 4690, 4691, LP711, LP714, LP721, and LP731 striker plates Fire resistance: suitable for fire doors