... 5.Surface:Black painting or oiled steel square tube/pipe 1)Thickness:0.5-30mm2) ... conduits, Cooling towers, Antenna and Telecom Towers, Cold storages, Tabular polesFire Protection Systems, HVAC, ... production and selling of square, round, rectangular pipe surfaced with galvanized coating, polish, ... always adhered to the business policy as "Quality for Survival, Product for Development, Credibility ...