Genuine White Porcelain Romanesque Style Mortise Doorknob Set (Non-Locking)This doorknob set is shown with a White porcelain doorknob set and Romanesque style rosettes. The mortise set box measures approximately 2 inches tall by 2 1 2 inches deep, and the face plate measures approximately 4 inches tall by 3 4 inches wide. The center to center (c c) mounting distance is approximately 3 3 8 inches. This set comes complete with two knobs, two rosettes, one mortise box, spindle and associated mounting hardware.