Kwikset 599 Gatelatch Double Cylinder Deadbolt featuring SmartKey in Polished Brass Designer style and superior security with this Kwikset Signature Series product For use on exterior doors where keyed entry and security is needed Featuring SmartKey re-key technology; re-key the lock yourself in seconds in 3 easy steps Deadbolt operated by key on both sides Features an adjustable latch to fit all standard door preparations