Building materials, steel, steel alloys, building structures, building frameworks, floors, staircases, partitions, castors, rollers, wire mesh, all made predominantly of metal; gravity and hand operated conveyors; shelves, racks, containers, bars, plates, strips, tubes, bolts, locks, keys, key boards, keyholders, fasteners, clips, nuts, washers, screws, hinges, fireproof metal cabinets; parts and fittings for all the aforesaid goods; all included in Class 6; but not including any such goods being linking units or adapted for linking.;