Arrowhead anchors are designed for anchoring TallTowers in rocky soils. The unique triangular design allows the anchor to thread its way between rocks in the soil. Arrowhead anchors are driven into the ground with a hardened steel drive rod. Once in the ground, the drive rod is removed, and upward force on the attached cable rotates the anchor perpendicular to the cable for maximum holding power. Cables are made of galvanized 7 x 19 steel, and the arrowhead is iron. Use arrowhead anchors when rocks in the soil will prevent successful installation of screw-in anchors. Reminder: NRG Systems offers its products exclusively to the wind energy industry. Anchors are sold for use with NRG Towers only.