GK-115 is a clear glass knob in the Art Deco Style. The knobs diameter is 1 1/8" and has a 1 1/8" projection. A nickel plated bolt and nut is included for mounting. Please note that while this is a very durable knob that will stand up to years of use, it is made of glass and will break if not carefully installed. Hand tightening only is recommended.