Grandeur Georgetown Rosette with Chambord Knob, Single Dummy, Polished Nickel Premium quality from Nostalgic Warehouse - Easy installation, with just a screwdriver Standard door thickness range is 1-3/8-Inch to 1-3/4-Inch. Comes with standard 2-3/8 backset Designed for Modern, Pre-Drilled Doors. Premium line of hardware, best for homes built after 1950 Levers also available 10-Year mechanical and finish warranty