... .positive and backward sewing 4.with 5 kinds of feet Characteristics:Aluminum alloy frameBuilt-in 16 kinds of stitchesFour-step buttonholingForward and reverse ... regulating 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 ...