Make your patio umbrella even more stylish by holding it secure in this Outdoor Interiors 20 in. Square Mosaic Umbrella Base. An intricate mosaic pattern adds detail to this square umbrella base. It's available in your choice of materials for a customized look. This umbrella base is built with a heavy-duty concrete core and weighs 60 pounds to ensure your umbrella will stay put. It includes a durable powder-coated collar with two large wing nuts for added stability. It fits standard and large umbrellas with posts up to two inches around.