This is a copper bonded 8 feet ground rod. The diameter of the rod is a full 1/2 inch. Minimum copper coating of 10 mils on rods listed to UL 467.8 ft. longOne pointed end99.9 percent pure electrolytic copper coating.Molecular bond to nickel-sealed high strength steel core.Rods have a high carbon steel core and tip that provide superior strength when driving. "Copper coating will not crack when bent or tear when driven.