The Aluminum Pyramid Post Cap by Titan BP is a smart and affordable way to dress up and protect your railing or fence post caps and pairs perfectly with the Titan Post Anchor. It's available in 3-5/8", 4", 5-5/8" and 6" openings for nominal and true 4x4 and 6x6 posts and comes with two flush mounted (countersunk) screws for a secure and permanent fit.