This machine is a special kind of sewing machine with single curved needle and single-thread chain traces. It’s widely used in positions of sleeve cuff, trousers cuff, glove tube edge and sock tube of various fabrics, such as knitwear, cotton textiles, woollen as well as chemical fiber etc. They are sewed in single-thread chain overlock trace and the stitch trace on the surface of clothes in invisible, so this kind of thread trace is called blind stitch, which can keep clothes looking beautiful. Equipped with skip stitch apparatus, model 500 overlock machine not only can sew general overlock trace but also can se skip stitch trace.