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About product and suppliers:
        Alibaba.com offers 1,176 hollow jack base products. About 60% of these are scaffoldings, 35% 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 1,196 hollow jack base suppliers, mainly located in Asia. The top supplying countries are China (Mainland), India, and Taiwan, which supply 89%, 10%, and 1% of hollow jack base respectively. 

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

You can ensure product safety by selecting from certified suppliers, including 740 with ISO9001, 128 with Other, and 33 with OHSAS18001 certification.