Common foreign commercial names are Africa'sNan, European walnut, Royal walnut, French walnut, English walnut, English walnut (Italian walnut), Ancona walnut, Circassian walnut, Persian walnut, Black Sea walnut. Black Walnut - Juglans Nigra Overview Alias: North American Walnut Hot Dip Galvanized Pipe,Seamless Steel Tube Gals,Large Outer Diameter Pipe Chengsheng Steel Pipe Co., Ltd , http://www.sdsteelpipes.com