... 5L,X60 C>OD: 6-610mm D>WT: 0.3-22m Black ERW Pipe A531> Standard: ASTM A106, ASTM A53, ... , API 5L GR.B, X46, X56, X60, X65, X70 3> Outer Diameter: 6mm-610mm (1/16"-24")4> Thickness: 0 ... random)6> Surface Finish: Oiled, Hot dip galvanized, Electro galvanized, Black, Bare, Varnish coating, Protective Coatings7> Zinc: 80-120g, 200g ... we can provide most suitable scaffolding pipes to you. Black ERW Pipe A53