Building materials of metal; portable buildings of metal; doors of steel; gates of steel; racks of metal for storage (other than furniture) as pallet racking of steel, drive-in racking of steel, flowrack of steel, drawer unit of steel, cantilever racking of steel, timber racking of steel, racking for standing timber of steel, modular shelving of steel, collision protectors in steel, steel constructions (buildings), mezzanines of steel (buildings), stairs and railing of steel.
