1.the product name:square tube 2.length:3--12m 3.all the products are made ... ,ASTM-A53.BS1387,JIS-G3444,GB/T3091-2001(2)Material: 20#,Q195,Q235,Q345,St 52,St 37,St 44,S355 ... ; Hydrostatic Test, Dimensional and Visual Inspection, Also With Nondestructive Inspection square tube