6 Building material of metal: Metal buildings and metal structures, namely roofs, awnings, pergola, brise-soleil, canopies, vent flaps, windbreaks, visual barriers, screens, and marquise; transportable buildings of metal; materials of metal for rails and railing; non-electric cables and wires of metal; locks of metal other than electric; metal clamps, hinges, cladding, rail end-caps, pipes of metal; railings of metal; rails of metal; handrails of metal; and profiles of metal for railings of glass installations