Depending on facility maker there are roll forming machines, which make grooves as below.
- LEIFELD Machine(made in Germany) : 6 rollers, 4 units
- JOA Machine(made in Korea) : 4 rollers, 8 units
- Sansui Machine(made in Japan) : 2 rollers, 3 units
- CDC Machine(made in China) : 4 rollers, 3 units
besides there are balancing machine 4 units, CNC machine 30 units, and washing/anti-rust/drying line.