Material: Copperweld rods with hardened steel cores. This product has passed the testing of ASTM E8/E8M-16 and ASTM B368-2014 with test reports.for ground rod,made of copper bond solid, sturdy reinforced steel.Adopted vertical electroplating technology.For ground wire,made of tinned copper stranded Green PVC insulated or copper clad steel. Specification: 4 feet long, 3/8 inch solid round ground rod. Accessories: Integrated Wiring clip. Main Usages:Grounding and lightning protection safety for household generators, Great for satellite dishes,off-air antennas, electric fencing, satellite antennas grounding,generator,computer room and electric fence grounding and earthing,and other grounding rod required equipment. It's recommended to use a rolled driving spike ,better than hammered tips. GOUNENGNAIL focuses on grounding and lightning protection research and manufacture,holding UL certificate No.E548063 ( Note:Only listed material can bear the mark) 3/8''x4' Electric Fence Grounding Rod,Signal Lightning Strike Protection Electrode.Copper Clad Steel for High Corrosion Resistance and Tensile Strength.