Kwikset 660 Single Cylinder Deadbolt featuring SmartKey Security in Satin Chrome Keyed entry deadbolt with a traditional Colonial design for an exterior door; easy installation in just minutes with a screw driver For use on exterior doors where a deadbolt on one side and keyed entry and security is needed Features SmartKey Security- Re-key your lock in 3 easy steps; Compatible with Kwikset KW1 Keyway Features adjustable latch to fit all standard door preparations; exposed screws on the interior face. Side locking bar technology offers improved security by protecting against lock bumping, an attack technique used to defeat conventional pin & tumbler locks.