Anyone that's ever lost a set of keys knows that sinking feeling all too well. You're not only locked out of your house, but what's worse is knowing that the person who found them isn't. But with a high-security Digital Deadbolt, you can unlock the heavy-duty deadbolt by entering a secret code that you choose. And because it can be locked from the outside with a simple twist of the knob, you won't need keys to lock it as you leave the house. Now you'll never have to worry about your keys being lost, stolen or copied again! Unlike other types of combination deadbolts or keyless entry systems, this one is 100% mechanical, requiring absolutely no batteries or AC current. That way, you won't have to worry about being locked out in the event of a power failure or battery run-down. The absence of a keyhole also provides additional protection, since no one can pick the lock, or jam it by breaking the key inside. The system can be customized to your needs easily, including changing the secret entry code. All you have to do is reposition the tumblers. You can even change the number of digits by adding the supplied tumbler, or removing one of the factory-installed tumblers. It can also be mounted for right- or left-handed operation as required by the position of the door hinges. Simply change a single pin. The deadbolt is made of a super-durable diecast zinc alloy, with stainless steel buttons. Includes two rubber escutcheons to install under the outside and inside body. These maintain the secure grip of the mounting screws and keep it waterproof. Designed for use on doors 1 3/16" to 2 3/16" thick (30-55mm). Additional Colors Available The Digital Deadbolt is also available in Brass, Antique Brass and Satin Nickel. *To determine the backset, measure the horizontal distance between the center line of the door knob and the edge of the door.