Penetrating fluke anchors dig into mud, sand or gravel and stow flat. Pivoting flukes rotate downward into bottom. Excellent weight-to-holding-power ratio, compared to cast anchors. All Attwood penetrating anchors are manufactured of hot dip galvanized steel for corrosion resistance and strength. The assembly is arc-welded steel that maintains consistent fluke-to-shank angles, ensuring quick penetration and a firm hold. These anchors have a solid shank for durability and strength.