Vital Parts rectangle metal fence post caps are designed to fit on the top of rectangular metal fence posts, such as those made of aluminum, steel or wrought iron. They are made of galvanised raw steel and come in different sizes to fit different types of rectangular metal fence posts. They have a rectangular shape with a flat top, designed to cover the post and provide a finished look to the fence. They are secured to the post by covering the end of the post to provide a weather-resistant barrier to protect the post from water and other environmental elements, which can cause rust and corrosion. They are durable and long-lasting, which makes them an ideal choice for outdoor use.