A ring roller is a machine used to roll steel material by forcing the material through rollers, also called dies. The rollers can be adjusted to form different radii. The maximum mild steel machine capacity is 1/4" x 1" flat bar or 1/2" round rod. The minimum diameter you can form is 2.75" | A ring roller is a machine used to roll steel material by forcing the material through rollers, also called dies. The rollers can be adjusted to form different radii. The maximum mild steel machine capacity is 1/4" x 1" flat bar or 1/2" round rod. The minimum diameter you can form is 2.75" |