... knobWith accessory for sewing zipper, darning, buttonholing,buttonholing and sewing buttonSewing function: flat seam, blind sewing, zig-zag sewing, buttonholing, sewing button, sewing zipper, hemmed, overlock ... and embroidery.Specification Needle: 11#--18#Straight stitch: 3.6mmPresser lift height: 6mmSewing speed(rpm): 650--800Power: Motor ...