This is a tiny tool, manufacturing marvelous arc sizes from 4,6,8,10mm steelrod, but whoever feel like creating iron rings with it, it's not a big deal. The rolls were bushed and turned from C45 steel. It was important for me, not to place the device in a cage, because if I make a ring then it cannot be taken out. The tool itself can be easily set in a clamp, after one-one squeeze with the help of the turning handle we can roll back and forth the given material. It can be used to make decoration stuff for arcs shaped bracings or even for making strong rings etc.
I made it from a 1 mm iron plate. After the suitable measurements and cutting, I used the power hammer, english wheel, a little shrinking at the edges, then the final touch was TIG welding. So I'm ready to call to life any fuel tanks or re-design an old one. The price is like 250 €, depending about the form and complexity.