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About product and suppliers:
        Alibaba.com offers 6,306 industry ratio products. About 7% of these are gearboxes, 6% are speed reducers. 

A wide variety of industry ratio options are available to you, such as planetary, harmonic, and worm. You can also choose from free samples, paid samples. 

There are 6,306 industry ratio suppliers, mainly located in Asia. The top supplying country is China (Mainland), which supply 100% of industry ratio respectively. 

Industry ratio products are most popular in North America, Domestic Market, and Eastern Europe. 

You can ensure product safety by selecting from certified suppliers, including 1,644 with ISO9001, 870 with Other, and 252 with ISO14001 certification.