Wonderful gift, sweet warm friend family and yourself Rubber band mounting systems: equipped with rubber band gasket / shrapnels to securely hold the insert in place, which allows for slight irregularity in the hole : the overall diameter of the clock insert 2.56inches / 65mm that refers to the front face outside maximums diameter including the colored bezels Suitable appearance design: three hands with arabic / roman numerals on dials allow for easy reading minis quartzs clock insert good for making or replacing clock faces