Arlington Handleset with Lido Lever - Deadbolt Keyed One Side - featuring SmartKey is a great security investment.  It's 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. It was easy to install and set up.  Directions were clear.  Beautifully styled and elegant look.