EC21 Buying Leads Catalogs - a 715 http://importer.ec21.com/buy_leads/a 715.html Buy Carbon Steel Tubes for General Structural Purposeshttp://www.ec21.com/offer_detail/Buy_Carbon_Steel_Tubes_for--2250542.htmla) Product Name : Carbon Steel Tubes for general structural purposes b) JIS G3444 or KSD3566 c) Thickness 1.0mm d) Oute20080921