Octagon Milk Glass Spare Door Knob Set (Several Finishes Available)Milk Glass Door Knobs Octagon Style 2 1 3 inch Diameter (point to point) Includes Two Spare Knobs and Passage Spindle Milk glass, known for its opaque white appearance resembling milk, was not as common as porcelain or glass knobs. But they were favored for their clean, understated elegance and durability. They were often found in Victorian and Edwardian homes, as well as in commercial settings of the era. Each knob measures approximately 2 1 3 inch