Soft thread tightening.Thread end on the back of cloth is eliminated.Stable button sewing without unravelling regardless whether the thread is thick or thin . Button clamp height: 14mmFeed length
(X-Y): 2-6.5 X 0-6.5 mmStitch pattern: invert C shapeButton size: 10-20 mm outer diameterMax. sewing speed: 1,500 rpmThread trimmer equipped as standard