... . 5.Surface:Black painting or oiled steel square tube 1)Thickness:0.5-30mm2)Size(dia.): ... and Telecom Towers, Cold storages, Tabular polesFire Protection Systems, HVAC, Plumbing,Fabrication industry, Food Processing, Pharmaceutical, Petrochemical, Chemical, Machine ... a large company specializing in the production and selling of square, round, rectangular pipe surfaced with galvanized coating, polish, ...