Traditional Rim LockA rim lock is a type of door security system that is fitted to the surface of the door rather than being morticed in. The rim lock uses a key to open the door, and is fitted with a surface mounted keep that should be fitted in the rim of the door and should not be visible from the outside. The From the Anvil Traditional Rim Lock is suited to older style doors with a raised moulding around the edge of the door and to doorways that don't have a locking