This portable metal safety door lock works with all standard door types. Just insert the lock before closing the door and then attach the red piece to the metal to seal the deal. Stay safe when you travel or if your door does not have a lock with this portable locking device. 

These secondary security door locks are perfect as they protect and don't damage the door or the door frame. A portable travel door lock can only be applied to your door if you are in the room, it cannot be applied to your door if you are out of the room. This will prevent people from trying to enter your room from the outside, even with a key.