Kwikset 665-S Double Cylinder Deadbolt with SmartKey from the 660 Series, Venetian Bronze Kwikset 665 For use on exterior doors where keyed entry and security is needed Double cylinder deadbolt operates by 2 keyed points, outside and inside Featuring smartkey re-key technology; re-key the lock yourself in seconds in 3 easy steps Easily installs in minutes with just a screwdriver