Installing deadbolts on your exterior doors will improve your home's security instantly and economically. A deadbolt only takes about an hour to install (per door) and most are universal installations, meaning that they can be installed on virtually any type of door. Deadbolts are available in single cylinder models and double cylinder models. Single-cylinder deadbolts have a lock cylinder on the exterior side that requires key entry and a handle on the inside that unlocks manually. Double-cylinder deadbolts require a key on both sides for unlocking and locking. Deadbolt kits are available for about $15 to $25 online and come with all the equipment you'll need including a lock cylinder (or two if it's a double-cylinder unit), a handle, a latch, a strike plate, and the necessary screws.
