Mounting Inside Diameter: 55mm/2.2 inch, insert diameter of the opening that the clock fits in, quartz movement clock Insert has a rubber band gasket to securely hold the clock face in place Appearance: smooth and bezel with exquisite workmanship, designed with black Roman Numeral, for easy reading Useful: Can use this clock insert to make clock crafts,or replacing old clock faces Feature: The craft clock insert, true silence with the smooth second hand, time accuracy,long life, Perfect for home, kitchen, office,etc Overall Outside Diameter: 61mm/2.4 inch, this is the outside diameter of the clock face, mounting depth:11mm/ 0.4 inch