Expanding Rock Anchor Rod  provide strength and stability to rock and concrete structures. They are constructed of a drop Forged tripleye rod and two opposing wedge halves.The anchor is placed in a hole pre-drilled in the rock. Twisting the eye of the anchor forces the wedges against the sides of the hole, locking the anchor in place. Load actually increases the wedging force and develops holding power equal to the full tensile strength of the rod. When anchoring in either bare rock or solid rock covered by soil, Rock anchors provide an extremely strong anchor point without the use of concrete.  Hot dip galvanized per ASTM A153.