2 1/2 Inch Octagon Double Dummy Violet Crystal Door Knob with Victorian Back Plate (Oil Rubbed Bronze Finish) - set made for both new construction homes as well as replacements for older worn knobs. Comes complete with the Interconnecting Rosette Plates, two glass door knobs, set screws and associated hardware and screws. The door knobs measure 2 1/4 inches (58 mm) in diameter and have a projection of 2 3/8" (60 mm) from the base of the glass door knobs to the edge of the glass door knobs. The rosette plates measure 2 1/2 inches in diameter (63.5 mm) and screw into one another (Interconnecting Rosettes). This door knob style is sold in Polished Brass, Antique Brass, Oil Rubbed Bronze and Satin Nickel. Choose from double dummy sets (shown), passage functional sets or optional locking styles. Functional door knobs come with a standard 2 3/8 inch back set latch, or you can request a 2 3/4 inch back set at no extra charge.