1. With this machine, mattress quilt and hand-pulling fabric can be over-locked and sewed up together. 2. It has double air cylinder, adjustable presser foot pressure, and stepless speed regulation. 3. It is suitable for sewing a variety of texture fabric. 4. The machine has heavy-duty five-thread safety stitch head and electronic thread break detection system. 5. It can realize automatic flange cutting and re-insert.