... 3) L:2~11.8m 4) Material: sheet metal square tube steel 1.size:10*10mm-600*600mm2.thickness:0.5mm ... .8m4. High Quality: ISO900:2000, API5L, API5CL Product square steel pipesStandardGB/T3091-2001,BS1387,ASTM A53, ASTM A106, ... EN10219MaterialQ195,Q215,Q235,Q345, 20#, A53 A/B, A106 B/C, St37, St52Outer diameter10 ... machine to make sure high quality. sheet metal square tube steel