This is a one sided deadbolt for patio doors. It does not come with keys or a keyed side. This is an interior deadbolt and doesn't show on the exterior of the door. For use on doors where you want to have a hidden deadbolt on the inside of your door. Universal handing; fits both right handed and left handed doors For use on patio doors, garage doors, front doors and other security doors where a hidden one-sided deadbolt is required.