This 67 lbs. umbrella base features a 20" round diameter foundation that secures with a bolt in the steel tube. Pick from two heights, 11 inches or 16.5 inches. The 11 inch base fits under poolside tables that accommodate umbrellas. While the 16.5 inches can be used for free-standing umbrellas. The umbrella requires a stable system that will keep your umbrellas from blowing away. The set screw tightens on the pole for security. The base comes in an off-white color that complements all colors.