POWERTRAC - copper bonded earth rod shall be made fromhigh tensile low carbon Steel. Earth Rods are molecularly bondedwith 99.9% pure electrolytic copper.??? Perfectly Bonded rod will last longer, drive easier and willnot crack.??? Corrosion resistance while providing the lowest resistance toground.??? Threads are rolled by roll threading process, which ensuresthat an even copper covering is maintained, even at the roofof the thread. Roll thread gives greater strength than cutthread. Thread rolling process raises the surface of the rod,so that thread dia (T) is greater than shank dia. (S). As seenin figure: -??? Copper bond earth rods are the ideal driven earthelectrodes, as they offer the installer an economical andefficient earth rod grounding system. pure electrolyte copperis uniformly molecularly bonded into a high tensile steelcore to a minimum thickness thus ensuring excellentcorrosion resistance and eliminating electrolytic action.