8 Inch Craftsman White Porcelain Door Knob (Polished Brass) - This beautiful doorknob is genuine white porcelain and measures 2 3/8 inches in diameter (approximate) and has a projection of 2 1/4 inches. Solid brass rosette plates screws directly into the door with four wood screws and measures 8 inches tall and 2 1/2 inches wide. The dummy door knob is a fixed knob with double rosettes and is commonly used on French-style or bi-fold doors. This style is available as a single sided dummy knob (1 fixed knob), double sided dummy knob (2 fixed knobs), functional passage (non-locking) and functional privacy (locking) sets. Single sided and double sided dummy options can be used with or without a borehole, if no borehole is present countersinking may be required. Functional door knobs come with a standard 2 3/8 inch back set, or you can request a 2 3/4 inch back set at no extra charge.