The glass lever knobs measure 4 1/2 inches long. Solid brass rosette plates screws directly into the door with three wood screws and measures 3 1/8 inches in diameter. The dummy door knob is a fixed knob with double rosettes and is commonly used on French-style or bi-fold doors. This knob set will fit a standard door thickness of 1 3/8 inch. This door knob set is available in several finishes and functions. Passage (Hall/Closet) and Privacy (Bed/Bath) sets come complete with the functioning hardware and a 2 3/8 inch back-set is standard. A 2 3/4 inch back-set is also available upon request. This particular product has a lead time of approximately 1 to 3 business days depending upon the chosen finish.