USED FOR ELECTRICAL AND MECHANICAL EQUIPMENT: This set of hex nuts, screws and washers are ideal for use in electrical and mechanical equipment as they reduce maintenance compared to other materials DURABLE AND GOOD INSULATION: Hex nut, screw and washer set is made of durable and eco-friendly polyamide material with the durable and stable performance and good insulation VARIOUS SIZES: There are different sizes available(M2 M2.5 M3 M4 M5) in this set which you can use for different purposes RUST RESISTANCE: Waterproof fasteners have rust resistance and easy to clean WELL PACKED DAN A PLASTIC BOX: All fasteners are well packed in a plastic box for convenient carrying and storage