... use more stable, lasting precision.2.Each of the roller speed changes with pipe diameter. Enable compression and extension of the ... by 5%.4.Equipped with a fixed size trench roller R series, tube geometry after compression high accuracy and ovality at ≤ 0 ... ,Two roller round center distance adjustment quantity: ±1.05, Pipe speed: 18m/min6, Pipe scope: φ5~147, External dimensions: 08: 1340x1600x1100mm ...