Copper bonded earth rods come with both internal and external threads, giving you the flexibility you need for various installation and extension requirements. The thread types and sizes are standardized, ensuring they work seamlessly with couplers, driving heads, and other accessories used in earthing systems. Common Thread Types and Sizes for Copper Bonding Earthing Rods: - In... https://www.pioneerpowers.com/copper-bonded-earth-rod.php