Dimensions: This clock insert has a total diameter of 3-1/2 inches/90 mm; Fits round holes with a diameter/mounting diameter of 3.0 inches/78 mm; Mounting depth is 0.6 inches/15 mm. Clear Cover with Bezel: The plastic bezel with quartz movement is great for DIY projects or replacing old clock faces. The clear cover makes it easy to read the time. Rubber Band Gasket: The rubber band gasket on this craft clock insert securely holds the insert in place and allows for slight irregularities in the hole. Wide Application: The plastic bezel with quartz movement is suitable for crafts or replacing old clock faces. The round clock insert can be used in many places. Power: This round table clock insert requires only 1 AA battery (not included). Warm note: The clock insert is intended for indoor use only and is not weather-resistant.