Prime-Line U 9919 Patio Door Lock, Different Key, Zinc, White, 3/16, 1/8, 1/4 in Thick DoorDie cast deadbolt lock. 5 16 in Dia bolt has 1 1 2 in long throw. Key locking feature. Throw bolt may be manually locked or key locked. Prevents forced entry. May be locked in ventilating position. Used on patio doors, sheds or utility doors. Surface mounted. Includes 1 lock and 1 set of installation screws. Unit: CD UPC: 049793099198 Model Number: U 9919