Add security to your entry door with the Marks Type Em D Kay Brand Lock USA Polished Brass Knob with Double Cylinder Deadbolt. The lockset features a polished brass finish for durability and functions with 2 mortise cylinders which throw the deadbolt or open the lock. Hardware is included for easy installation. Fits 1-3/8 - 1-3/4 in. interior and exterior doors Ideal for security storm doors Reversible design fits right-hand and left-hand doors Flat-ball doorknob with bolted mounted knob rose trim Brass finish for durability Operates with 2 mortise cylinders to throw the deadbolt or open the lock1 in. deadbolt offers excellent security Hardware included for easy installation Includes 2 keys Meets ANSI Grade 2 specifications