Product Description Size: This clock face insert has a total diameter of 3 1/2 inches/90 mm; it fits a round hole with a mounting diameter of 3.0 inches/78 mm; the mounting depth is 0.6 inches/15 mm. Transparent Cover with Frame: The plastic frame of this quartz movement is suitable for DIY crafts or replacing an old clock face; the transparent cover makes it easy to read the time. Rubber Gasket: The rubber gasket on this craft clock face insert securely holds the insert and allows for slightly irregular hole diameters. Versatile Use: The plastic frame of this quartz movement is suitable for crafts or replacing an old clock face; the round clock face insert can be used in a variety of situations. Power Supply: This round desktop clock face insert requires only one AA battery (not included). Note: This clock face insert is for indoor use only and is not waterproof.