Downtown Signature Series Single Cylinder deadbolt for use on exterior doors where keyed entry and security is needed. Featuring SmartKey Security which protects against advanced break-in techniques and allows you to re-key your lock yourself in seconds. SmartKey Security re-key technology is compatible with Kwikset (KW1) keyway or (SC1) keyway options. Deadbolt operated by key outside and thumb turn inside. SmartKey cylinders feature a stainless steel side locking bar, racks, and pins for increased strength and security.