With two straight needles,self-lubricated vertical-axis rotating hook for catching thread loops and sliding cam thread take-up,the machine can produce two lines of lockstitch,synchro feeding of needle bar and 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 bearings.With synchro tooth belt for driving and plunger pump for lubricating,it is available for stitching shirts, uniforms,overalls,women’s underwear jeams,etc.