Kumwell Copper-Bonded Ground Rods meet the requirements of the rigorous standard-UL. The copper layer whose
minimum thickness is 254 micron met the UL standard.
Standard size diameters commonly used are 1/2”, 5/8”, 3/4”, and 1”.
Standard lengths commonly used are 4’ to 10’.
Thread type ground rods are available to extend the length of ground rods by using coupling.