Designed to fit 4" x 4" aluminum fence posts Easy to install, simply slide the cap onto your fence post and gently tap with a rubber mallet to secure it Pack Size: 2 ball cap style post caps Made from high-quality aluminum that has been powder-coated black to prevent rusting A way to add a sleek, finished look to your fence all while protecting it from damage that can be caused by snow, water, ice, and debris Whether you are building a new fence or need replacement caps for an existing one, this pack of 2 ball post caps will be just what you need to get the job done. Designed to fit 4" x 4" fence posts, these caps will give your aluminum fence a nice finished look while also protecting the posts from harmful damage. These ball caps are made from high-quality and durable aluminum that has been powder-coated black to prevent rusting.