United mouth is ideal interface for pipe connections, not only nice but also not connected to any other auxiliary tools. F300 and F301 can be accurately combined the mouth of the combination of high-quality gap, does not damage the metal surface, and low noise, perfect seam, sewing together seams, F125 only for legislation, or even combined with the angle of the mouth corners and for in different thickness, excellent performance, a pneumatic optional, together sewing machine F140 fast, safe, strong and joints, you can work for the special mediation, continuing the work of the period of no vibration, no additional power supply. 
 Automatically adjust for thickness, starting when the mouth is not dependent on the United board high, in turn, when the external parts of the machine does not require conversion, high technology and ergonomic design makes the application is very convenient, F301 for the seam height of 7.5 mm, F301 also has an optional pneumatic