Kwikset 816-15-RCAL-RCS Smart Key Control Single Cylinder Deadbolt, Satin NickelThe Smart alternative to master keying. Kwiksets Key Control Deadbolt, featuring SmartKey re key technology, is a revolutionary cost and time saving alternative to master keying. Re keying a traditional master key system is labor intensive, time consuming and costly. With the first and only two cylinder Key Control Deadbolt, either cylinder can be re keyed in seconds, without removing the lock from the door. Retain your one key access to all units and