6 Metal hardware, namely, connecting pins in the nature of metal ball lock pins and cotter pins of metal, screws, nuts, washers, dowels, nails, screw nails; retaining elements for fastening, namely, compressible spring elements, namely, metal spring washers, curved metal washers; retaining elements for fastening, namely, tight-fit securing elements of metal, namely, washers, crown nuts, cotter pins and split pins of metal; retaining elements for fastening, namely, jamming securing elements of metal, namely, locknuts, counter-nuts, gripping locknuts, thread rolling screws, thread grooving screws; retaining elements for fastening, namely, micro-tight locking fasteners of metal, namely, pawl bolts, pawl nuts, pawl washers; retaining elements for fastening, namely, adhesive fasteners of metal, namely, bolts, nuts and washers, all coated with an adhesive; blind rivet, blind rivet nut, sealing rivets, sealing plugs, self-sealing blind rivet, all goods above made of metal or mainly of metal; metal hardware, included in this class, namely, metal carabiners, metal springs