Decoiler, Pipe Bending Machine, Pipe Punching Machine manufacturer / supplier in China, offering Lja Brand High-Speed Automatic Spiral Tubeformer HVAC Round Duct Efficient Duct Making Machine, High-Speed Spiral Duct Machine Large Range 80mm~1500mm Diameter for Galvanized & Stainless Steel Pipes for Round Duct Making, Applicable Lja Wingspan Spiral Duct Machine for Producing Spiral Ducts with Different Diameters and so on.