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About product and suppliers:
        Alibaba.com offers 17,512 head diameter products. About 1% of these are plastic tubes, 1% are steel pipes. 

A wide variety of head diameter options are available to you, such as q235, a53(a,b), and 20#. You can also choose from erw, cold rolled. As well as from structure pipe, gas pipe. And whether head diameter is api, astm, or jis. 

There are 17,512 head diameter suppliers, mainly located in Asia. The top supplying country is China (Mainland), which supply 100% of head diameter respectively. 

Head diameter products are most popular in North America, Domestic Market, and Southeast Asia. 

You can ensure product safety by selecting from certified suppliers, including 4,003 with ISO9001, 1,553 with Other, and 1,380 with ISO14001 certification.