6 METAL BUILDING MATERIALS FOR USE IN THE CONSTRUCTION AND REPAIR OF BUILDINGS, NAMELY, BEAMS, COLUMNS, DECKINGS; PANELS, PREDOMINATELY OF METAL, NAMELY, FLOOR AND CEILING PANELS; PANELS MADE PREDOMINATELY OF METAL BUT FILLED WITH CEMENTITIOUS MATERIAL, NAMELY, WALL, FLOOR AND CEILING PANELS; PILINGS OF METAL, STEEL PANELS, NAMELY, WALL, FLOOR AND CEILING PANELS; AND PARTS FOR ALL OF THE AFORESAID GOODS