A door closure is a mechanical device that closes a door in a controlled manner, preventing it from slamming.

A mortise lock is a lock that requires a pocket—the mortise—to be cut into the edge of the door into which the lock is to be fitted.

A knockdown door is provided with a frame that would normally be welded, however the hinge jamb, strike jamb, and head are provided loose.

Commercial pre-assembled doors are completely assembled under factory-controlled conditions. Additionally, pre-assembled doors are custom built to your job specifications, so they fit like a glove with easy installation.