This pressed glass knob set is one of the oldest items we have here at the store. These sandwich-glass knobs date back to as early as the Civil War. Because of their age (1865-1880s) they do have some chipping. The chipping, however, is at the base of the knobs where it is not so noticeable. Each knob has chips at the base, but the tops and sides are in great shape. There are no cracks.
Each knob measures 2 inches across the top. The octagon (eight sided) knobs have about a 1/2-inch recessed center where the bolt is inserted. (one knob has chipping around the bolt head hole.) These knobs would need a 1/4-inch bolt. The knobs project 1 7/8 inches from the drawer surface. The octagon-shaped base is 1 1/2 inches across.
We recommend a 1/4″ all-thread carriage-head bolt, at least 2 3/4 inches long.