The Andersson 4603 Rod Coupling Nut is designed to securely join two pieces of 3/8"-16 threaded rod, either vertically or horizontally, to extend their length. Constructed from durable carbon steel with a zinc-plated finish, this coupling nut offers corrosion resistance and reliable performance in various applications. Measuring 1-1/8 inches in length, it conforms to standard specifications for rod coupling nuts, ensuring compatibility and ease of use. This coupling nut is ideal for construction, electrical, and plumbing projects where threaded rod extensions are necessary.