The brass knob measures 2 1/4 inches in diameter. Solid brass rosette plates screws directly into the door with four wood screws and measures 3 inches in diameter. The polished brass comes in an un-lacquered state and it will age naturally over time. The dummy door knob is a fixed knob with double rosettes and is commonly used on French-style or bi-fold doors. Single sided and double sided dummy options can be used with or without a borehole, if no borehole is present countersinking may be required. This style is available as a double sided dummy knob (2 fixed knobs), functional passage (non-locking) and functional privacy (locking) sets. 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. This particular product has a lead time of approximately 4 to 5 business days.