Black Roman Insert 3 1/2" is a standard clock insert with a plastic case, metal clips, plastic bezel & plastic crystal. This model has a gold plated bezel, blackdial & gold Roman numerals. The outside diameter is 88.9 mm (3-1/2"), fits hole 76.2 mm (3"), depth of case (without the bezel) 17.5 mm (11/16"). The movement is not supplied with the battery. *Please purchase an "'AA" battery separately.