The Hamilton umbrella base ensures that your umbrella will remain securely intact with style and practicality. Built out of concrete, the 33 pound base can accommodate an umbrella with a diameter of 5 feet. The base rod features a tightening knob to easily secure any sized umbrella pole. Place one under your dining set to provide a shady and relaxing outdoor dining experience with your favorite outdoor umbrella.FeaturesConstructed from solid concrete materialFeatures a tightening knob for a secure fit33-pounds will ensure a firm foundation for umbrellas as large as 5 feet.Ideal for creating a shady and relaxing environment in your backyard or patio.Dimensions (in inches)17.70" D x 17.70" W x 2.75" H