The frame is fabricated from steel pipes.
- The ND models are fitted with an adjustable brake.
- Support by orientables roll bearings.
- The mandrel from steel by 3 inclined plane with expansion range from 470 to 550 mm and hydraulic cylinders which are activated by a electric pump.
- Brake with pneumatic clamp.
- Planetary gear-box + trasmission by double or triple chian.
