Easy to install; Screws into ground with anchor when you use a ZIP CAP adapter. Saves money; you don't need to stock two types of anchors. Saves space; packaged 8 to a box for easy transport. Better performance; free-floating ZIP CAP doesn't move when anchor pulls vertically. More flexibility; approved for use soil class 2 & 3 with 120004 and soil class 4 with 120019.