Coupling M22Features: Coupling made from high strength copper alloy, can protect the ground rod thread into the underground without damage and slow down the corrosionUsed for connecting rod and rod, rod and driving head According to the need can increase the length of the rodConnection is threaded, screw type M22For use in grounding and lightning systemsSpecifications: Material: brassRod diameter: 20mmScrew type: M18Length: 68mmOuter diameter: 26mmWeight: 150g