Quartz Clock Movement: For 10mm (3/8 inch) Surfaces. Walnut Hollow clock movements offer watchmaker's accuracy and dependability. They're suitable for repair or restoration of all kinds of clocks or use them to create your own unique timekeeper with a Walnut Hollow wood clock surface (not included). This package contains one Quartz Clock Movement and clock hands. Finish: brass. Requires one AA battery: not included. Imported.