3-1/8 Inch (80 mm) clock insert fit diameter 3.0 inch (76 mm) hole Unique design: The clock mechanism insert features a plastic rim, clear plastic lens, and black arabic numerals on white dial Arabic numerals dial: Black arabic numerals on white dial is easy to read. Craft decorating or replacing: Suitable for craft projects and replacing mini clock faces. Warm note: 1. The quartz clock insert requires 1 piece AA battery, not included. 2. The clock insert replacement is intended for indoor use only, not weather resistant. Specifications: Overall diameter: 3-1/8 inch (80 mm) Mounting depth: 0.7 inch (18 mm) Mmounting diameter: 3.0 inch (76 mm) Package includes: 1 x Clock insert