6 Structures in the nature of transportable metal constructions and transportable buildings of metal; containers and industrial packaging containers for transportation, of metal; metal hardware, namely, structural joint connectors, steel plates, metal pipe connectors, plugs, couplers being pipe fittings, screws, bolts, nuts, retaining rings being a ring-shaped fitting, lock rings being a ring-shaped fitting, snap rings being a ring-shaped fitting, expanding sleeves for affixing screws, sockets being wire rope fittings, self-tapping bushes, collars for fastening pipes, quick-fitting pipe junctions, in-line quick pipe couplings, flat steel, flat rolled steel, steel rods, furniture leg levelers, chimney shafts, and flanges; metal seals, other than those used in vehicle engines and machinery, for use in trailers, semitrailers, vehicle dollies, towing vehicle bodies, commercial vehicles, truck combinations, trailer combinations, and trucks; metal seals, other than those used in vehicle engines and machinery, for connecting of cables and lines on vehicles and trailers; metal gaskets, other than those used in vehicle engines, for use in trailers, semitrailers, vehicle dollies, tractors, vehicle bodies, commercial vehicles, trucks combinations, and trailer combinations; metal gaskets for connecting of cables or lines to vehicles and trailers; metal hose couplings for use with hydraulic lines, pneumatic lines, electrical lines, power beyond lines, data lines, water lines, fertilizer lines, cleaning agent lines and combinations thereof; metal hose couplings for multifunctional use, with hydraulic hoses, pneumatic hoses, hoses for electrical lines, hoses for power beyond lines, hoses for data lines, water hoses, fertilizer hoses, cleaning agent hoses and combinations thereof; metal hose couplings for use with load sensing systems; unwrought or semi-wrought common metals; metal doors, gates, windows and window coverings, namely, sunshade covers in the nature of metal window shutters, curtain walls, and shutters; locking assemblies of metal, other than electric