Emtek Low Profile Double Cylinder Deadbolt Emtek Double Cylinder Deadbolts have a keyed cylinder on the inside as well as on the outside. These deadbolts are generally used on doors that are part glass, the door can't be unlocked with out a key. It is not recommended on most doors because it increases the danger of a person trying to get out in case of a fire. Emtek Low Profile Style Double Cylinder Deadbolt Specs - Schlage keyway - Standard door prep - Solid brass cylinder, housing collar and rosette. - Hardened steel bolt - Heavy guage steel understrike and brass trim strike shipped with every deadbolt. - Backsets are non-adjustable. Please specify backset when ordering. - Shipped with square corner strike and mortise plates. Rounded corner plates or drive in latches available upon request. You might also like: Emtek Low Profile Style Single Cylinder Deadbolt |