In a nutshell..... we make round copper post caps, all sizes to fit your decks or docks. We achieve this by having the capabilities of fabricating on the ¼" increments of your post diameter. Please feel welcome to call us anytime with your questions and we'll also explain how to achieve the nicest fit possible. Our website also has other products designed not only to preserve and reduce maintenance on your investment, but also to enhance your home. Nortek CopperWorks has an excellent BBB rating and was established in 2001. During that time span we have helped and sold to over 6900 residences. Each order is custom fitted to your specific needs. We look forward to hearing from you.