Silver 20mm Head Astm Standard Galvanized Stainless Steel Coupling Nut

These 20mm head couplings are made of corrosion-resistant stainless steel, so they'll stand up to the elements and keep your equipment running for years to come. These coupling nuts have a hexagonal head that's designed to fit securely in the threads of other parts, so you can make sure all your parts are securely fastened together. They're also heat-treated to resist wear and tear, which means they'll last longer than regular screws.