Alloys of common metal; Angle irons of metal; Bars for metal railings; Bolts of metal; Fences of metal; Frames of metal for building; Hooks of metal for roofing slates; Hot-rolled steel bars; Pilings of metal; Pillars of metal for buildings; Rails of metal; Roofing of metal, incorporating photovoltaic cells; Substrates primarily of metal for supporting solar cells, photovoltaic cells and solar collectors; Trellis of metal; Tubes of metal