Carabiners of metal; Ducts of metal for ventilating installations; Metal door hardware, namely, keys and key cylinders; Metal filtering tubes used to prevent storm water runoff pollutants from entering sewer systems; Metal hooks; Metal louvers for guiding light; Metal self-aligning demountable snap fasteners consisting of press fasteners and press studs for use in attaching panels, hatches, floors and furniture in boats, motor vehicles, trains, aircraft and buildings; Metal vent cover for HVA...