... -300 Hydraulic Forming MachineDiameter: DN50-300mmNo. of layers: single or double layersType of the bellows: annular bellowsApplications: for auto exhaust bellows ... : DN200-630mmNo. of layers: single or double layersWall thickness: Single layer1.0-3.0mm Double layers:0.8*2-1.6*2Type ... , 300,350,400,450,500,550,600mm Hydraulic Metal Hose Making Machine