... :2~11.8m 4) Material: sheet metal square tube steel 1.size:10*10mm-600*600mm2.thickness:0. ... A363.length:2~11.8m4. High Quality: ISO900:2000, API5L, API5CL Product square steel pipesStandardGB/T3091-2001,BS1387,ASTM A53 ... , in loose or seaworthy packing , wrapped with steel strip or at sellers optionUsageConstruction, bridge, highway, machinery ... Mechanics testing machine to make sure high quality.