It is designed for optimum performance in both cracked and untracked concrete. Higher load capacity and vibration resistance: threads along the length of the anchor undercut the concrete and efficiently transfer the load to the base material. Vibration and shock resistance: the mechanical interlock of the threads and the ratchet teeth on the underside of the head help prevent the anchor from loosening in vibratory conditions. Specialized heat treating process: creates superior surface hardness at the tip to facilitate cutting, while at the same time not compromising ductility within the anchor body.