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What are the advantages of our hex nuts and screw set? Hex socket screws and nut set are made of high quality 12.9 grade alloy steel, which has good corrosion resistance, high temperature resistance and wear resistance and is durable. Black screw and nut are both housed in a clear plastic box with matching labels and are easy to use and install. The design of the hexagon socket cap is easy to install with a hex key and does not slip out easily. Used in electronic products, electrical products, furniture, household appliances, maintenance of bicycles, cars and motorcycles, mechanical equipment, ship accessories and other fields.