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About product and suppliers:
        Alibaba.com offers 1,315 adjustable screw base jack products. About 46% of these are scaffoldings, 1% are car jacks. 

A wide variety of adjustable screw base jack options are available to you, such as scaffolding props, scaffolding frames, and scaffolding planks. You can also choose from free samples. 

There are 1,338 adjustable screw base jack suppliers, mainly located in Asia. The top supplying countries are China (Mainland), India, and Taiwan, which supply 87%, 12%, and 1% of adjustable screw base jack respectively. 

Adjustable screw base jack products are most popular in Mid East, South America, and Southeast Asia. 

You can ensure product safety by selecting from certified suppliers, including 553 with ISO9001, 80 with Other, and 17 with OHSAS18001 certification.