Features:This umbrella base is made of durable HDPE material, all-weather resistant. Includes a solid steel pole, the steel pipe is galvanized and would not corrode easilyFeaturing a hand-turn tightening knob and fitting for 1.5inch,1.9inch,2inch diameter poles.It is good at keeping shape, reducing the risk of chipping or breakage, while securely supporting your umbrellas.Used to fill water or sandSuitable for different decor designs, you could put it on courtyards, gardens, terraces, swimming pools, restaurants and other scenarios as well as a variety of residential and commercial uses. It could be a good partner to your umbrella.