To properly install locking devices onto doors, be sure to use the right type of cylinder. A mortise cylinder is a threaded cylinder that is round and is often flush with the lock. Rim cylinders are used with exterior locks and they have a long tail piece for strength. Deadbolt cylinders offer added security to exterior doors, commonly known as the top lock on your front door. We also carry an abundance of keys to use with these cylinder locks. For key storage, we have a variety of key lock boxes and key cabinets.