Skeleton Clock Insert 4-1/16"4 1 16" ( 103 mm ) diameter Gold Roman Skeleton Clock Insert features a clear view of its internal rotating gears. This unique clock insert has 2 chapter rings,one for hour minute and one for seconds. Features a gold tone bezel, clear plastic backplate, and glass lens. With hands as shown in photo. The back is enclosed to protect against dust. Runs on 1 AAA battery (not included). Holds into a 3 3 4" dia. hole with a rubber friction ring. Overall