... sewing machine 2,chain stitch:12mm 3,sewing alibity:22mm 4,sewing speed:800r/min 1,YT180 leather sewing machine2,chain stitch:12mm3,sewing alibity:22mm4,sewing ... is single needle, compound feed walking foot sewing machine is ideal for sewing leather, canvas, synthetics and other thick material ... and bottom feed), the GB6-180 can easily sew heavy materials with heavier thread.Speed of sewing800s/minShape ...