Is a new product of heavy duty lockstitch sewing machines.It is designed with link thread take-up,large rottating hook,link top and bottom feeding machanism and presser foot alternating machanism,it has the features of outstanding heavy duty sewing,outstanding multi-layer sewing capability,narrow stitch length difference between forward feeding and reverse feeding,beautiful stitches,low noise,low parts wearing,and easy maintenance,this machine is widely available for stitching all kinds of leather,synthetic leather,canvas for sofas,cushions,bags,sports apparatus,office furniture and heavy duty garments.