Metro Industries, based in Helena, Alabama, specializes in the manufacturing of Corona Rings and a wide range of aluminum products for the electrical utility industry. With decades of industry experience, the company has earned a reputation for delivering high-quality, precision-engineered components designed to meet the demanding requirements of high-voltage applications. Metro’s Corona Rings are primarily used as control and grading components in electrical systems, including switches, substation bus hardware, and transmission line dead-end assemblies. These specialized rings help minimize radio and television interference caused by corona discharge — a phenomenon that occurs when the electrical potential of a conductor exceeds the dielectric strength of the surrounding air. Committed to quality craftsmanship and dependable performance, Metro Industries manufactures products using durable materials and proven production processes to ensure reliable operation in critical utility applications. Since the 1960s, the company has produced hundreds of thousands of Corona Rings across more than 2,000 unique designs, along with a variety of custom aluminum products serving the power transmission and utility sectors.