Beautiful look – great level two security. Weiser's SmartKey re-key technology provides you the flexibility to re-key your locks quickly and easily without removing them from your door. Plus SmartKey cylinders represent a quantum leap in security as compared to traditional pin- and-tumbler cylinders. The lock cylinder uses two steel balls inserted into the front of the key face to resist attack from drilling. Featuring a full 1" projection deadbolt, a 1/4" hardened steel, free-turning roller and heavy duty mounting screws, this deadbolt will provide the security and peace of mind you're looking for. This brass Troy combination cylinder and deadbolt set works with door thickness: 1-3/8" - 1-3/4".