Double Cylinder Iron Gate Ornamental Knob Rose Entrance Mortise Lock Set - Black Finish, Thru-Bolted, With 2-1/2" Backset, 1"x7-1/8" Faceplate, 1" Deadbolt, LHR Left Hand Reverse Handing (Like Marks 22AC-W-LHR), Replacement For Marks 22AC. For Residential & Commercial Gates/Storm Doors/Doors Metal or Wood. This Left Hand Reverse mortise lock features a manual deadbolt for smooth, intuitive operation, designed for reliable access control with effortless locking and unlocking. Standardized Dimensions: Suitable for entrance doors with a thickness range of 1-3/8 inches to 1-3/4 inches, with a Backset size of 2-1/2 inches from the keyhole to the end of the door, and the Faceplate size is 1 x 7-1/8 inches, the mortise lock set can be installed on most standard doors to save space. Security Design: The double cylinder mechanism provides protection against forced entry, includes an additional Deadbolt mechanism for reinforced security, offering peace of mind in residential or commercial settings. Heavy Duty Steel Construction: Crafted from heavy gauge steel, this mortise lock set delivers exceptional durability and strength, built to withstand daily use while maintaining smooth operation over time. Modern Style: The Double cylinder mortise lock features an elegant Black finish that adds a contemporary touch to the door/gate, combines sophisticated style with robust security performance.