The Backyard Expressions umbrella base features a sturdy 17" Diameter base & weighs 21 lb. This item comes with adaptors to support three different umbrella sizes & provide a secure fit every time. Add one to your outdoor patio or backyard area & you will no longer have to worry about a shaky umbrella. Enjoy the appeal that the interlocking ring design & antiqued Bronze finish will bring to your outdoor home decor!