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About product and suppliers:
        Alibaba.com offers 1,025 hollow jack base products. About 56% of these are scaffoldings, 40% are ladder & scaffolding parts, and 1% are metal building materials. 

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

There are 1,042 hollow jack base suppliers, mainly located in Asia. The top supplying countries are China (Mainland), India, and Kenya, which supply 96%, 3%, and 1% of hollow jack base respectively. 

Hollow jack base products are most popular in South America, Mid East, and Eastern Europe. 

You can ensure product safety by selecting from certified suppliers, including 621 with ISO9001, 124 with Other, and 25 with OHSAS18001 certification.