1. This machine adopts large scale vertical-axis roating hook with self-lubricating feature for catching thread loops and sliding bar take up to produce two lines of lines of double lockstitch .
2. The needle bar can be engaged and disengaged mechanically and arm shaft and hook shaft are supported by ball bearings.
3. It is provied with synchro tooth belt for driving, plunger pump for lubricating, knob-type stitch regulator and lever type reverse feeding mechanism. It is recommended for stitch overalls, uniforms, jeans, womens underwear and decorative sewing on bags.