Deadbolts are necessary to provide that extra amount of security you desire. Geo offers both the single cylinder and double cylinder functions of deadbolts in a variety of finishes. A single cylinder deadbolt has a key locking the outside and a thumbturn on the inside of the door. It should be used when no windows are present in or near the door. A double cylinder deadbolt utilizes a key to open both the exterior and interior of the door. It provides extra security when windows are present in or around the door.
