4 interlocking plates give stability for windy days, Lock-down U-pins system enhances wind protection, Setup is simple with aligned and connected plates, Hdpe base is weather-resistant, sun-protective, wear-resistant, fade-resistant Wide spouts allow plates to fill with ease, Twist caps prevent leaks while you fill plates, All 4 plates hold up to 132 lbs for maximum stability, Cleaning is quick with easy-to-empty base plates, Fits 9-10 ft offset hanging umbrellasFits 8 ft cantilever umbrellas, 4 plates can be stacked together to save floor space, Equipped with grooved handles for easy carrying, Note: the umbrella is not included.