2.This machine has the automatic unlocking device,if the various sizes of puller used in this machine differ within 3MM,there is no need to adjust the unlocking device.
3.The structure is more resonable . Sliders will not fade and lose paint easily during mounting.
4.After mounted slider by this machine, the zippers at both top and bottom sides of sliders are closed, so that both sides of the zippers can be fixed with bottom stop.