The deadbolt to my new apartment What is that tiny slot to

The deadbolt to my new apartment What is that tiny slot to door lock slot If the key is still stuck, remove the lock cylinder and push the key out by inserting a stiff wire into the slot at the back You can also door mail slot cover Choose the Right Lock to Fit Your Door · Backset: The distance between the edge of the door and the center of the lock hole Usually, the backset measures 2 38-

door mail slot cover Choose the Right Lock to Fit Your Door · Backset: The distance between the edge of the door and the center of the lock hole Usually, the backset measures 2 38-

door mail slot catcher W&F style mortise lock - face has round end with vertical slot when locked ​Squared off lock body with flat mounting plate Installed with 6-32 machine screw The lock mortising kit fits wooden doors of 25-100mm thickness The maximum opening groove depth is 130mm ,