Common metals and their alloys including stainless steel; Doors and windows of metal; Bicycle parking installations of metal; Works of art of common metal; General purpose metal storage containers; Metal clips for general use; Metal vent covers for roof deck protrusions, drains and pitch pans; Hardware, namely, metal brackets for general use; Metal bonding fasteners for mounting and demounting of ceiling and wall panels; Ducts of metal for ventilating and air-conditioning installations