Differential feed: perfect, smooth seams without crimping and gathering. Variable stitch length: 1 to 4 mm. Variable stitch width: 3 to 6.7 mm. Easy threading: thread paths are colour coded. Sewing with or without knife: the upper knife can be folded away as required. Setting wheels can be operated from the outside. Sewing foot change: quick and easy at the touch of a button. Useful stitches: 3-thread flatlock seam, 3-thread overlock seam, 3-thread roll hem, blind hem, 4-thread ultra-stretch overlock.