The Backyard Expressions Cast Stone Umbrella Base features a sturdy 18 Inch Diameter Base and weighs 20 pounds. This item comes with adaptors to support three different umbrella sizes and provide a secure fit every time. Add one to your outdoor patio or backyard area and you will no longer have to worry about a shaky umbrella. Enjoy the appeal that the interlocking ring design and antiqued bronze finish will bring to your outdoor home decor!