The Kwikset Halifax Double Cylinder Deadbolt features SmartKey technology which allows you to re-key your lock in seconds with 3 simple steps. It is operated by a key on the exterior and the interior. This deadbolt had a solid zinc constructions and the interior section has exposed screw fixings. Suitable for use on exterior doors where keyed entry and security is needed and is supplied with a latch that has a round face plate. The latch has an adjustable backset with a 1 inch throw deadbolt. Furthermore, this deadbolt has BumpGuard which protects the lock from being compromised through key bumping. Supplied with 2 keys.