3/4" Copper Ground RodGround Rod, Copper, Length: 10', Diameter: 3 4", Corrosion Resistant, Average Tensile Strength: 80,000 PSI, Straightness Tolerance: . 01" per Linear Foot. 99. 9% 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 Minimum copper coating of 10 mils on rods listed to UL