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About product and suppliers:
        Alibaba.com offers 15,897 working diameter products. About 1% of these are steel pipes, 1% are plastic tubes. 

A wide variety of working diameter options are available to you, such as q235, 10#, and a53(a,b). You can also choose from api, astm, and jis. As well as from structure pipe, fluid pipe, and gas pipe. And whether working diameter is hot rolled, erw, or cold drawn. 

There are 16,050 working diameter suppliers, mainly located in Asia. The top supplying countries are China (Mainland), India, and Pakistan, which supply 98%, 1%, and 1% of working diameter respectively. 

Working diameter products are most popular in North America, Western Europe, and Domestic Market. 

You can ensure product safety by selecting from certified suppliers, including 4,367 with Other, 3,441 with ISO9001, and 322 with ISO14001 certification.