Designed to fit externally on 6" x 6" square aluminum fence posts 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 Pack Size: A single post cap This cap not only gives your fence a finished look, but also protect it from harmful damage that can be caused by water and debris build up within posts Add a finished and stylish look to your aluminum fence all the while protecting it from harmful damage by having this 6" x 6" post cap. Made from durable, rust-resistant powder-coated aluminum, this post cap is built to last even in the toughest of weather. This aluminum post cap is designed to fit externally on a 6" x 6" aluminum fence post and can be easily installed by tapping it on with a rubber mallet.