... >OD: 6-610mm D>WT: 0.3-22m Black ERW Pipe A531> Standard: ASTM A106, ASTM A53 ... > Surface Finish: Oiled, Hot dip galvanized, Electro galvanized, Black, Bare, Varnish coating, Protective Coatings7> Zinc: 80-120g, ... 200g, 300g, 400g8> Other: Cut-to-length,Threading, coupling, necking, punching is available upon request. ... can provide most suitable scaffolding pipes to you. Black ERW Pipe A53