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 a......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. where to buy this product contact the manufacturer