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About product and suppliers:
        Alibaba.com offers 30 duplex roller chain products. About 100% of these are chains. 

A wide variety of duplex roller chain options are available to you, such as stainless steel, iron, and alloy. You can also choose from drag chain, transmission chain, and conveyor chain. As well as from free samples. 

There are 30 duplex roller chain suppliers, mainly located in Asia. The top supplying country is China (Mainland), which supply 100% of duplex roller chain respectively. 

Duplex roller chain products are most popular in North America, Eastern Europe, and South America. 

You can ensure product safety by selecting from certified suppliers, including 19 with ISO9001, 7 with ISO14001, and 3 with Other certification.