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About product and suppliers:
        Alibaba.com offers 20,898 steel manhole products. About 17% of these are cast & forged, 2% are metal building materials, and 1% are other construction & real estate. 

A wide variety of steel manhole options are available to you, such as stainless steel, steel, and iron. You can also choose from industrial magnet, general, and structure pipe. As well as from free samples, paid samples. 

There are 20,804 steel manhole suppliers, mainly located in Asia. The top supplying countries are China (Mainland), India, and United States, which supply 99%, 1%, and 1% of steel manhole respectively. 

Steel manhole products are most popular in North America, Eastern Europe, and Oceania. 

You can ensure product safety by selecting from certified suppliers, including 4,540 with ISO9001, 1,546 with Other, and 1,188 with ISO14001 certification.