The Pro 4DX makes serger sewing easy! Incorporating the differential feed system of two feed dogs- puckered edges on woven fabrics and stretched edges on knits are virtually eliminated. The rolled hem conversion feature eliminates the need to change the needle plate- foot or tension setting for rolled hemming. Restructured lower looper guides allow easy access. The included threading card and color-coded guides are easy to follow for 2- 3 or 4 thread serging. A solid metal base for heavy-duty performance and noise dampening. Precision and convenience for easy decorative finishes and maximum versatility.