Check the listing for details. M3x0.5mm Coupling Nut, 10Pcs Brass Hex Coupling Nut 20mm, Gold. Condition: New. Listed at 8.30 USD. Description:[Material] Made of brass, the coupling nuts are strong and wear-resistant, have anti-oxidation, high-temperature, and corrosion resistance, and have good electrical and thermal conductivity.[Features] The hex rod coupling nuts adopt a six-sided design, which is easy to grip and can achieve maximum torque, allowing you to tighten easily and efficiently. It is used to install bolts or machine screws to connect two fasteners or accessories completely, the most common ones have threaded rods[Easy to Install] Coupling nuts are easy to install and only need to be tightened with a wrench to assemble and connect two parts and be careful not to over-tighten.[Wide Application] Coupling nuts can be widely used in furniture repair, office equipment, automobile, mechanical industry, communication equipment, etc.