A metal rod is a long, cylindrical piece made from various metals, such as steel, aluminum, or copper. These rods can vary in diameter and length, making them suitable for different applications. They are commonly used in construction, manufacturing, and engineering due to their strength and durability. Metal rods can be solid or hollow and are often used to provide support or reinforcement in structures. They can also be shaped or cut to fit specific needs. In addition, metal rods are essential components in tools, machinery, and various mechanical systems.