Helix anchor. 3500 LB break out force in firm clay inprotected harbors. Must be installed all the way into the ground up to the eye. If you hit ledge you cannot use a helix mooring. Good soil conditions consist of clay and sand mix. Diver installed except in shallow water installations. A good tool for installation is a 4' bar. It should require some effort to screw it in. The harder it screws in the better the holding. Always check with your local harbor master for proper application.