steel pipes, metal tubes, metal casting pipes, galvanized metal tubes, metal pipes with anticorrosive coating, fittings for metal tubings, metal sockets, namely metal pipe connectors, manually operated metal valves, metal tubes for air-draught and air-conditioning sets, metal constructive apparatus, namely metal pipes used in building construction, metal prefabricated components, namely, metal scaffolds, metal posts, metal windows, metal doors, metal staircase, metal sheds, metal wire-post and metal wire fences, metal rails, steel plates, steel wires, steel piles, namely steel pipes used as piles in building foundations, steel pipe sections, namely quadrate and rectangular pipes, metal conduit for electrical use and metal casting tubes for electrical use