Heavy duty oriented: This patio market umbrella base stand is made of strong and durable resin and iron, which is really hard and long-wearing. Resin made of outdoor umbrella base stand is durable and stable, perfect for outdoor usage. Market standard base: This patio umbrella base stand is equipped with rubber adapters that fit the market standard umbrella pole diameter: 3.8cm/1.5’’, 4.8cm/1.9’’. It can fit into most cantilever umbrellas with more choices. Clear instruction: All the necessary hardware and handy tools are included in the package. This product requires least assembling process with a well-illustrated instruction manual. It is noticed that this patio umbrella base stand compatible with 3.8cm/1.5’’, 4.8cm/1.