GDK-101 is set of our octagonal clear glass door knob, a style popular in the late 19th and early 20th centuries. Made of pressed glass, this knobs has great detail and clarity which is further enhanced with silver foil under the glass that amplifies and the light to show off it's beautiful facets. The quailty construction includes a brass base with a brushed nickel finish. The set includes 2 knobs, a steel spindle and allen or hex wrench to set screw adjustment. The knob measures 2 1/4" in diameter. The bottom diameter of the base is .61". This knobs can be used with any of our door knob roses or back plates as well as our lock sets. This knob is also available in with a base in polished brass, antiqued brass, polished nickel as well as oil rubbed bronze. Please note that the knobs are a special order item and may take up to ten days to ship. They are returnable if you are completely satisfied.