6 Common metals and their alloys; steel; steel products; building and construction materials of metal; pipes, sheets, pipelines, pipe connectors, pipe branchings, pipe bends (each made of metal and steel); steel pipes, stainless steel pipes, discharge pipes, branch pipes, approach pipes (each made of metal and steel); pipe accessories, namely, pipe sleeves, pipe clamps, pipe elbows, valves, sliders, girders, sealing caps, fixing material, cramps, flanges, caps, fittings (each made of metal and steel); metal and steel frames, metal and steel rings; water pipe valves (metal); Metal valves for controlling the flow of fluids in pipelines; Metal valves for controlling the flow of gas in pipelines; Flap valves of metal; Metal valves, namely, Ball Valves, Plug valves, Multi-Turn valves, Butterfly valves, Check valves, Bellow Seal valves, Control valves, Cryogenic valves, HF acid valves, Knife Gates valves, Pressure seal valves