Designed to fit externally on 3" x 3" square aluminum fence posts Pack Size: 5 black aluminum post caps Made from rust, corrosion, and weather resistant black aluminum Simply slide the caps on to your desired posts and tap securely into place with a rubber mallet These caps not only give your fence a finished look, but also protect it from harmful damage that can be caused by water and debris build up within posts This pack of 5 black aluminum post caps is the perfect stylish and protective addition to any metal or aluminum fence. Designed to fit externally on 3" x 3" square fences posts and be easily installed. Simply place the caps onto your fence posts and tap with a rubber mallet to secure. Made from high-quality and durable aluminum these caps are rust, weather, and corrosion-resistant to ensure long-lasting use.