This umbrella stand is made of galvanized carbon steel, making it very strong and durable. It can be attached anywhere you want, such as stairs, benches, back gates, boats, table fences, and decks. It is ideal for umbrellas, flags, and fishing rods. The tube diameter is 1.5 inches and it features a thumb screw to securely hold the umbrella and adjust the height. Please note that the umbrella is not included and it is only compatible with bars up to 1.5" in diameter and deck railings with a thickness less than 1.96".