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About product and suppliers:
        Alibaba.com offers 1,649 manual screw jack products. About 47% of these are car jacks, 23% are speed reducers, and 2% are ladder & scaffolding parts. 

A wide variety of manual screw jack options are available to you, such as worm, helical, and bevel / miter. You can also choose from paid samples, free samples. 

There are 1,657 manual screw jack suppliers, mainly located in Asia. The top supplying countries are China (Mainland), India, and Taiwan, which supply 98%, 1%, and 1% of manual screw jack respectively. 

Manual screw jack products are most popular in North America, Domestic Market, and Southeast Asia. 

You can ensure product safety by selecting from certified suppliers, including 737 with ISO9001, 198 with Other, and 86 with ISO14001 certification.