... two sizes of tubemill as follows:1. DN15-300 Tube Welding Unit Tube diameter: DN15~DN300mmWall thickness: δ≥0.2-1.2mmControl: inverter ... machines: Rubber clamping parts (for caterpillars) and related guiding plates,DN15,20,25,32,40,50,65,80,100,125,150 ...