Rubber seal ring: The rubber seal ring around the bottom border of the clock can make it sink tightly into art project. Easy to installation: The clock back cover can be disassembled which is easy for you to install the battery. Convenient suspension: Hole design allows for the clock hanging on the nail and clip. Appearance and design: Mechanism clock features plastic rim and quartz movement; Roman numerals in big sizes are black, allowing for reading easily. Nice accessories: Roman numeral clock is nice accessory to make craft projects and replace mini clock faces. Indoors only: It can be applied to replace your clock insert which cannot work anymore; The clock is suitable for indoors only. Size: Overall diameter: 3-1/8 inch (80 mm) Mounting depth: 0.7 inch (18 mm) Mounting diameter: 3.0 inch (76 mm) Package includes: 1 x Clock insert