Kwikset 91590-002 Halifax Slim Square Double Cylinder Deadbolt featuring SmartKey in Polished Chrome Designer style and superior security with this Kwikset Signature Series product For use on exterior doors where keyed entry is on both sides and security is needed Features SmartKey Security- Re-key your lock in 3 easy steps; Compatible with Kwikset KW1 Keyway Meets ADA/ANSI A117.1 requirements, ensuring accessibility to all disabled persons Alignment post for easy install and strengthened springs to ensure lever doesn't sag over time