Dimension: the overall diameter of the clock insert is 2.8 inch (70 mm) that refers to the front face outside maximum diameter including the colored bezel Features: the quartz clock insert features a gold colored trim, clear plastic lens, and black roman numerals on white dial for easy reading Mounting diameter: fit round hole diameter: 2.4 inch (61 mm); Mounting depth: 0.7 inch (17 mm); Great for crafts or replacing old clock faces Rubber band mounting system: complete with rubber band gasket to securely hold the insert in place, which allow for slight irregularity in the hole Power: require 1 piece AAA battery (not included); Warm note: clock is intended for indoor use only, not weather resistant