Metal rivets; fastenings devices made completely or principally of common metals and structural parts therefor, namely, [ threaded fasteners, threaded inserts, anchors, bolts, pins, pivots, ] rivets, [ screws, washers, bushes; fastening materials, namely, bolts, rivets, split pins, ] of steel, iron or metal; fastening devices of metal, namely, rivets, [ bolts and screws ] and structural parts therefor