6 Building materials of metal namely, nuts, divided nuts, bolts, taper pins, sleeves, screws, threaded parts being threaded fasteners, protective caps , protective screws, cone sleeves and fastening and connection elements; quick couplers being pipe connections of metal; pipes of metal; high pressure pipes of metal; high pressure metal cylinders; self-tapping and insert bushings of metal; bolt-sleeve combinations, of metal, namely threaded fasteners; construction materials of metal for the production of shaft-hub connections, shaft connections, flanged connections and axle connections of metal, namely, nuts, divided nuts, bolts, taper pins, sleeves, screws, threaded parts being threaded fasteners, protective caps, protective screws, cone sleeves and fastening and connection elements and quick couplers