When metal is bent, we use a punch and a die. The punch and die are shaped in such a way that when placed together, their cavity is the shape that you want your finished product to have. Metal is placed between them, and hydraulic cylinders put exert anywhere between 35 – 250 tons of pressure. This pressure forces the metal to conform to the shape of the die and voila, the metal is bent. Multiple bends can be made on the sheet to form different shapes.