Metal rollers are used to form round sections from sheet metal. You can make hoops, cylinders, cones, or any other combinations of those shapes with a metal roller. Metal rollers come in a range of sizes and can start from small bench-mounted rollers with manual hand cranks to large motorised units. Metal rollers usually consist of three rollers lying parallel to each other in a triangular formation. You can adjust the spacing between the three rollers to change the radius of the final product. The sheet metal is inserted into the metal roller and runs along the three rollers to make the final rounded shape.