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About product and suppliers:
        Alibaba.com offers 985 hollow jack base products. About 54% of these are scaffoldings, 41% are ladder & scaffolding parts. 

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

There are 985 hollow jack base suppliers, mainly located in Asia. The top supplying country is China (Mainland), which supply 100% of hollow jack base respectively. 

Hollow jack base products are most popular in South America, Eastern Europe, and Southeast Asia. 

You can ensure product safety by selecting from certified suppliers, including 621 with ISO9001, 114 with Other, and 31 with OHSAS18001 certification.