Buttonhole Machine 1.High-speed, strong ability , low noise 2. manufacturer 3. with upper amd lower thread trimmer Sample:Screen:Details: SpecifcationMax. Sewing speed2500rpmMax. Sewing Thickness40mmCutting ModeCut first or cut afterStitch length0.5-2.0mmStitch form1 stitch, 1 thread (genuinehand stitch)ThreadCommon ThreadNeedle Type & Size780C, 16#, 18#, 20# 23#Sewing Width2.8-7. ...