Double the size of the kettle and shuttle, eliminating the hassle of frequently changing the bottom line of the shuttle, reducing work waste, and improving sewing efficiency; Comprehensive feeding mechanism, smooth and comfortable sewing, uniform and beautiful stitching, high quality; The design of the seam adjustment mechanism not only provides precise settings, but also allows for easy adjustment of the size of the front and back seam powders; Easy to operate; Adopting a new type of automatic refueling structure design, it has anti-wear characteristics; Suitable for sewing shoes, bags, wallets, etc.