What's this key slot for?

Shop 8020 T-Slot Panels & Door Components door slot lock Once you've drilled all the way through the locking mechanism, force a slotted screwdriver into the key slot, and twist open the lock door letter slot Get the European Style Door Grid Lock Guide Slot Lock For Shutter Manual Door Cord Lock Garage Door Emergency Lock online at Jumia Nigeria and other Generic

door mail slot catcher After you remove the key make sure to check the lock by both locking and unlocking the door This also works very well for pesky mailbox