Name: ERW steel pipe Standard: EN39, EN10219 Material: Q235, Q345 Specification: 1" to 16" Useage: construction NB (INCH)O.D(MM)W.T(MM)133.43.381-1/442.23.561-1/248.33.68260.33.912-1/273.05.16388.95.493-1/2101.65.744114.36.025141.36.556168.37.118219.18.1810273.09.2712323.810.3114355.611.1316406.412.70 Also, we can produce as your special requirment.