6 Base metals and their alloys namely, unwrought and partly wrought common metals and their alloys in the form of billets, pipe, tubes, rods or blanks for further manufacturing; steel; metal construction materials namely, metal tubes and pipes, bars and solid rods, profiles, girders, metal sheets, fittings, shores, supports and braces for construction of wells, platforms, and oil field and offshore rig structures; metal transportable constructions namely, metal tubes and pipes bars, solid rods, profiles, girders, metal sheets, shores, supports and braces, off shore drilling platforms, prefabricated metal platforms, for wells, platforms, and oil field and offshore rig structures; metal tubes and pipes for the oil and gas industry and custom machined seamless steel tubing, tubing for the manufacture of axles, steel tubes and pipes manufactured to match specific requirements for the production of oil and gas field drill pipe, casing, tubing and couplings, hollow tubing for roller-bearings, pipe fittings, pipe tees, pipe reducers and pipe bends, pipes and tubes used in the manufacture of high-pressure gas cylinders and other pressure vessels, coated metal line pipes, machined cylinder barrels, feedwater heater tubes, pipe fittings, foundation piles, gas list tubes, steel pipe and tubes for applications in mechanical and civil engineering namely for use in the manufacture of hydraulic cylinders, rollers, axles, cranes, foundations, oilfield and offshore rig structures, header pipe, hollow metal bar for machining, metal line pipe and metal linings therefor, riser pipe, and superheater tubes; threaded metal tubes for oil and gas; threaded metal sleeves for assembling metal tubes for the oil industry and gas, metal devices in the nature of metal pipe connectors for suspending casing and tubing; threaded metal assembly devices, namely threaded metal tubes used particularly in the oil and gas industry; metal assemblies for tubes and oil fittings, namely, metal tubes and pipes, bars and solid rods, fittings, profiles, girders, metal sheets, shores, supports and braces; non-electrical metal cables and wires; metal hardware namely, nuts and pulleys; metal oil pipe fittings