Sophisticated device design - Simple and frm installation, easy disassembly,Compatible with all brands of flat lock sewing machines Micro Pneumatic and Motor Control-It can precisely control the length of the front edge, and the tightness can be adjusted With anti-roll function, automatic induction of bone position - after passing through the device, the actions completed by skilled manual workers can be quickly and effectively com- pleted, and the production effciency and product quality can be greatly improved