Copper Bonded Earthing Grounding Rods Earth Clamps Brass Bronze Gun metal casting and cast components, Earth Rods Grounding earthing rods are made from high tensile-low carbon steel complying with requirements of BS 4360 Grade 43 A. Each rod is molecularly bonded by 99.99% pure, high conductivity copper bondings, each rod is treated with Benzol-triozole derivatives. Threads on rods are formed by roll threading process, giving threads extra strength, eliminating risk of chipping the threads while driving the rods in the ground.