... 4) easy to be operated goods in stock, fast delivery,200 tons, 3.2 M bending length,multi-V lower die ... .Foot pedal, 3.Punching tool and lower die, 4.Torsion bar, 5. Hydraulic system6. Back gauge, 7. Upright, 8. Electrical cabinet ... synchronization system--Mechanical-hydraulic synchronization system, which use a torsion bar to ensure the parallelism between beams, it’s a efficient ...