We have a glass door knob with 8 sides. We only have the 1 of these. It has a star/flower center and a brass metal lower portion. It measures about 2 1/4" across the center front x about 2 1/4" in D. The threaded portion on the bottom is round with the inside measuring about 3/8" across. It is in nice conditiion with the brass being slightly tarnished .