Zexum 4Ft Copper Bonded Earth Rod This ground rod is used to carry current safely away from a circuit in the event of an electrical surge to the earth/ground. This copper bonded earth rod are suitable to protect a structure from power surges / lightening strikes, directing the lightning through the earthing system and into the ground rod rather than passing through the structure and presenting a danger to people, this is why an earthing rod is required in public buildings & large structures. Note: If you place a current probe around the conductor going to earth or the ground rod itself you should never see any current flowing on the conductor. Main Features: For Earthing Protects electrical circuits Technical Data: Diameter: 3/8 inch & 5/8 inch Material: Copper Length: 4ft / 1200mm 1 Year Guarantee from the Manufacturer