Union Assa Abloy Multibolt Lock,Model M3303ab.

Locking Mechanism: The lock features multiple bolts, likely three or more, that extend into the door frame to provide enhanced security. These bolts are visible at the top of the lock. Handle and Cylinder: The lock has a handle for operating the latch and a key cylinder for locking and unlocking the bolts. The key is shown inserted in the cylinder.