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About product and suppliers:
        Alibaba.com offers 3,530 best ratio products. About 1% of these are gearboxes, 1% are speed reducers. 

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

There are 3,530 best ratio suppliers, mainly located in Asia. The top supplying country is China (Mainland), which supply 100% of best ratio respectively. 

Best ratio products are most popular in North America, Western Europe, and Domestic Market. 

You can ensure product safety by selecting from certified suppliers, including 1,130 with ISO9001, 592 with Other, and 137 with ISO22000 certification.