Ensure your patio umbrella stays put in style with this DC America 17.7 in. Square Cast Stone Umbrella Base. Durable cast stone composite materials give this umbrella base its weather resistance. A bronze powder-coated finish highlights each raised leaf and flower detail. This umbrella base fits a 1.5-inch umbrella post using the plastic insert or up to a 2-inch diameter umbrella. It features a turn knob for added stability.