The Dor-Mor pyramid mooring anchor rapidly penetrates the bottom due to the high-point loading of its compact size and shape. Once covered, the large surface area of the pyramid has a high suction effect. These anchors have been used successfully on the rough Maine coast since 1973. These made in the USA anchors are great for shallow water, and have been hurricane proven. Your satisfaction is guaranteed, and it comes with a 10-year rust out guarantee.