Locking machine is the most basic air duct making machine, by simple adjustments you can achieve a machine can complete the joint seams, flat seams, single, vertical seams, C-type cutting seams and elbow function. The company's machines are used flat seams, pressure bearings, side to avoid wear and tear, to extend the useful life of equipment, to ensure the stability of forming seams. In addition, I have a high with a locking machine, wheel made of GCr15.