... and speed reducer gear.Down rolls can life vertically, side rolls lift slope, the precision is ≤±0.15mm ... ideal rolls with very less edge once, compare with 3 rolls machine, no need to press machine to do pre-bending.The ... technique, famous brand productions.Hydraulic cylinder with high precision, excellent airproof, without leakage.Equipment cone bending device. Hydraulic 4 roller bending machine