Synchronous belt wheel, refers to the general made of steel, aluminum alloy, cast iron, brass and other materials, its inner hole has a round hole, D hole, cone hole and other forms. Synchronous belt wheel drive is composed of a closed ring tape with teeth of equal spacing on the inner surface and the corresponding belt wheel. Surface treatment has natural oxidation, blackening, zinc plating, color zinc plating, high frequency quenching and other treatments. Accuracy level depends on customer requirement.