With two straight needles ,self-lubricated vertical-axis rotation hook for catching thread loops and sliding can thread take-up,the machine can produce two lines of lockstitch,Synchro feeding of needle bar and feed dog assures even stitches and prevents materials being sewn from shifting,Knob-type stitch regulator and lever type reverse feeding mechanism permit convenient operation.The arm shaft and hook shaft are supported by ball beatings,With synchro tooth belt for driving nd plunger pump for lubrication,it is available for stitching shirts,uniforms,overalls,women's underwear Jeans.etc