This Mini Round Clock Movement is a high-quality product that is made in Germany. With a 3/16″ long shaft, it is compatible with various types of clocks such as table & shelf clocks, clock radios, desk clocks, and travel alarm clocks. The quartz movement ensures precise timekeeping without any audible ticking noise. The clock movement is designed with a black plastic case and has an unknown era. It is suitable for those who prefer a simple and elegant design. The Youngtown brand guarantees the reliability and durability of the product, making it a great replacement part for your clock.diameter is about 2 inches (52.5) and Canon pinion lower part is 4.10mm,upper part is 3.45mm