This traditional style Double Cylinder deadbolt features a hardened steel anti-saw pin, a case hardened steel drive rod and hardened steel screws to enhance your security. This deadbolt requires a key to lock and unlock on both the interior and exterior sides, for additional security. Utilizing a KW1 keyway ensures that you"ll always be able to get a key made. It fits exterior doors between 1-3/8-Inch and 1-3/4-Inch and the backset is adjustable between 2-3/8-Inch and 3-3/4-Inch. The US3 polished brass finish is protected by a clear powder coat. Legend locksets feature a limited lifetime warranty.