6 Metal building materials, namely, steel, stainless steel, unwrought or semi-wrought brass, aluminum and its alloys, stamped metal sheets, folded metal sheets; mechanical fastening elements made entirely or principally made of metal; metal or principally made of metal fastener connection elements, namely bolts, screws, nuts, rivets, rivet nuts, anchor nuts, inserts; anchor bolts made of metal; metal or principally made of metal dowels, connecting dowels and hardware metal pins; metal or principally made of metal screws; plates made of metal, in particular metal plates for a positive-fit and interlocking connection with one or more non-metallic components, namely, fastener plates of metal, connection plates of metal, spacer plates of metal; small items of metal hardware, namely, bolts, washers, rivets, pins, connecting pins, plugs, threaded inserts, metal rods, threaded rods, bolts, screws, screw nuts, tubes and ball connectors; products made of metal, namely, screws and nuts; connecting elements and fastening elements in the nature of metal clips for general use, metal staples for construction use, screw rings, locking plates, fixing plates, fasteners being hinges and clips; all the aforementioned products featuring a partial coating of synthetic material.