6
Building and construction materials and elements of metal; doors, gates, windows and window coverings of metal; unwrought or semi-wrought common metals; metal hardware; nuts, bolts and fasteners, of metal; parts and fitting for all the before mentioned goods
37
Installation, cleaning, repair and maintenance of doors, gates, windows and window coverings of metal, unprocessed and semi-processed materials of metal, not specified for use, metal hardware, nuts, bolts and fasteners, of metal, parts and fitting for all the before mentioned goods; advisory services relating to installation, cleaning, repair and maintenance of doors, gates, windows and window coverings of metal, unprocessed and semi-processed materials of metal, not specified for use, metal hardware, nuts, bolts and fasteners, of metal, parts and fitting for all the before mentioned goods