The coupler is made of high-strength copper alloy, which can protect the grounding rod thread from damage and slow down corrosion when it is driven underground.
It is used for the connection between rod and rod, rod and driving head, and the length of rod can be increased arbitrarily as needed.

5/8Coupler 3/4Coupler M16Coupler M18Coupler M20Coupler M22Coupler M27Coupler