The Addalock adds an extra layer of security to most properly installed inward-swinging doors, even if there’s no lock on the door. It installs and removes quickly, so you can use it both at home and when you travel.
The Addalock is made up of two parts: the steel claw that you insert into the door frame and which grips the strike opening; and the red wedge that keeps the door closed. A chain connects the two parts so you don’t lose either of them.
Here’s some more requirements for using the Addalock: the door must swing inwards, there must be a 1/4″ gap between the door and jamb, the latch must retract completely when you turn the door knob, and the door must close freely with the Addalock in place. If any of these criteria aren’t met, the door can get jammed shut.
Open the door, insert the claw part into the strike hole, and close the door to hold the claw part in place. Then insert the pin of the red wedge into one of the holes of the claw body, and push the wedge down until it’s secured against the door. To open the door, simply pull up on the wedge and remove it from the claw part.
One Addalock will run you $20.