FunctionButtonholing for ordinary cloth, knit, etc.Its suitable for all light and medium weight materials. This machine is capable of forming two different types of stitches, namely flat stitch and triangle stitch. The sewn seam is beautiful and firm. High sewing speed and adjustable buttonhole length. width and stitches NO. Automatic lubrication system and thread trimmer are equipped Widen78122mm2.5-4mm1/4"-3/4"3600r.p.mDP×5 75,80,85,90,(11#-14#)12mm