Four adjustable footpads on this 20 x 20 x 13 in patio umbrella base let you fine tune each corner so the base sits level and helps keep your umbrella steadier on slightly uneven ground. The flat profile allows it to slide under many patio tables so it does not take up extra floor space. A center tube with a tightening handle holds the umbrella pole firmly in place once adjusted. Two included adapters fit poles with 1.6-in and 1.9-in diameters for flexible use with different umbrellas. Powder-coated steel and PP construction is built to handle outdoor weather while supporting up to 35 lbs.