1. Professional: Forms a 3thread overlock chain stitch on light and thin fabrics, ensuring firmness and stability while preventing fabric edges from loosening. The concealed chain stitch offers elasticity, making it suitable for sewing stretchable and recoverable undergarments. 2. : Adjustable stitch length (1.5 3 mm) and overlock width (3 4 mm) meet diverse edgesealing needs. The stitch tension adjustment ensures even thread tension and stable sewing force, preventing fabric distortion. 3. Material: Made with cast iron technology and surface baking finish for durability, rust resistance, and precision. Has a fixed presser foot and needle plate with a nut to avoid skipped stitches and maintain consistent, neat stitching. 4. Application: This overlock sewing machine is designed for multilayer fabrics such as silk, linen, cotton, wool, and synthetic fibers, as well as singlelayer 3 or 4thread edge finishing. It provides quick and effortless seam sealing.