Earth rod with copper coated.or purple copper coated. The length and diameter can follow your demand! Excellent quality! The size of this earth rod is 2meters in length and the diameter is 17mm.The material is medium carbon steel and copper-coated.The thinkness of copper coated is 250micron.manufacting process can be copper plating and copper clab.size can be designed according to the requirementsdriving head, earhting clamp, coupling can drilling head can be optional  ,both end can be threadone end can be tipped.