F300 and F301 seam locker machine can accurately and high quality combine the gap of the joint port, without damaging the surface of the metal, and the noise is low, the joint is perfect, the plate thickness is automatically adjusted, and the plate height is not dependent on the joint port when starting, when turning at the periphery no need to change the parts of the machine, high-tech and ergonomic design makes it easy to apply. It is an ideal tool for duct processing.