Pyramid anchor Department: Unisex Color: Anchor Pyramid Width New Pyramid Anchors seachoice 43880 Model 43880 Weight 25 lbs. Boat Size Up to 10' : Pyramid anchors provide excellent holding power and work in tidal waters and rocky or sandy bottoms. They are superior to concrete blocks because the anchor rapidly sets itself by presenting a digging edge to penetrate the bottom. The pyramid shape presents a large surface area which creates high suction that increases the deeper it sets. The short shank allows mooring in shallower waters without chain wrap-up a characteristic of mushroom anchors.