Kwikset 660 3 SMT SCAL SCS Single Cylinder Deadbolt Featuring Smart Key, Polished Brass For use on exterior doors where keyed entry and security is needed Featuring smart key re-key technology; re-key the lock yourself in seconds in 3 easy steps Deadbolt operated by key outside and thumb turn inside Latch includes square corner faceplate Ansi/bhma grade 3 certified