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About product and suppliers:
        Alibaba.com offers 999 hollow jack base products. About 55% of these are scaffoldings, 41% are ladder & scaffolding parts, and 1% are metal building materials. 

A wide variety of hollow jack base options are available to you, such as free samples, paid samples. 

There are 999 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 Southeast Asia, South America, and Western Europe. 

You can ensure product safety by selecting from certified suppliers, including 608 with ISO9001, 104 with Other, and 40 with OHSAS18001 certification.