Description: Dimensions: The front diameter of the clock insert is 90mm/3.54in, back diameter (including rubber Rings) 78mm/3.07in, Installation depth: 15mm/0.59in. Features: Metal frame, metal hands, and black Arabic numerals on dial for easy reading. Fixing method: rubber fixed, can be directly inlaid and fixed on the clock seat, you can DIY the clock yourself, or use it to repair or replace a broken clock, easily read the time and prevent dust from entering the dial. You need a 1x 1.5 V AA Battery (Not Included) Classic style: suitable for classrooms, offices, living rooms, guest rooms, meeting rooms, restaurants or any other places. Specification: Material: Metal Battery: 1x1.5 V AA Battery (Not Included) Size Chart: Front diameter: 90mm/3.54inch Back diameter: 78mm/3.07inch Installation depth: 15mm/0.59inch Package Includes: 1 Piece Clock Insert Note: 1. Please allow slightly error due to manual measurement. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item.  3. Wish you a wonderful on-line shopping!