3-1/2" Clock Inserts fit 3" diameter hole or 3-1/8" with the included rubber ring. Attractive Roman numerals and a fancy gold center. Simply mount the unit into your choice of material. These clocks feature an elegant metal dial,plastic lens and gold color bezel. With hands as shown in photo. Operates on AA battery (not included). Overall Diameter: 3-1/2" Mounting Depth: 7/8" Mounting Diameter: 3"