The Parkoworld Umbrella base is made from high quality Resin material with a unique design. The Parkoworld umbrella base has a metal post and a very high quality tightening knob. This umbrella base includes sleeves for a tight post fit, raging from 1.49 inches to 1.89 inches. This umbrella base can be used in any outdoor area. The parkoworld umbrellas are all a perfect fit for the umbrella base. Most other patio , valet and outdoor umbrellas fit with this base because of its different size sleeves. Great quality , long lasting and beautiful design makes this parkoworld umbrella base one of a kind.