Features: battery cover Quartzs clock movement, stable, and precise timing. Shafts diameter 13-28mm, for various clock designs; Low energy consumption, long. Silents operations will not interfere with your rest. Handmade watchmakers, watch enthusiasts, watch manufacturers and other professional in the watch industry. It can used to make various clock products such as high-end watches, wall clocks, and table clocks, for homes, offices, shops, and other place. Specifications: Materials: Plastic shell Types: Shafts 13, Shafts 16, Shafts 18, Shafts 22, Shafts 28(optional) Package Includes: 5Pcs Quartzs Clock Movement note: Please allow 0-1cm error due to manual measurement. please make sure you not mind before bid. Due to the differences between different monitors, the picture may not reflect the actual of the item.