This 18" diameter dome offers the ultimate protection from rain, snow, and squirrels for all Aspects’ Tube Feeders. Cross-Center Slotting System allows the Super Tube Top to fit all Aspects tubular feeders snugly. Simply slip this dome over the bail wire and rest it on the feeder’s cap - no hardware needed!. Made of sturdy polycarbonate and backed with a lifetime guarantee. Image Courtesy of Aspects, Inc