BRASS COUPLER. 5/8 50MM-The Copper-Bonded Ground Rods are the most widely used grounding electrode Copper bonded rods and electrodes are suitable for deep driving into most ground conditions and provide a low resistance path to ground. We are offering a whole range of Copper Earthing Rods/ Grounding Rods, Brass Couplers, Gunmetal Brass Type 'A O&G Clamps and accessories to meet the electrical industry demands.Brass clamps are usually made from a type of brass called admiralty brass, which is a corrosion-resistant alloy made mainly from copper (70-74%) and zinc (24-28%). This type of brass has excellent corrosion resistance in seawater and marine environments, making it ideal for use in marine applications, such as shipbuilding and offshore oil platforms. The exact composition and properties of the brass may vary depending on the manufacturer and the specific requirements of the application.