We provide OEM support. The item properly shows environmental protection and power saving. The new items include a collection of higher-tech and large good quality chains and sprockets and gears, these kinds of as chains and gearboxes for agricultural machineries, metallurgical chains, escalator stage-chains, large-speed tooth chains, timing chains, self-lubrication chains, between which have type large velocity tooth chain for car branch dynamic box and aerial chains fill in the blanks of chain in China.