This machine is a new product of Highlead brand extra heavy duty lockstitch sewing machine series, which is designed with special rigid arm and wide bed for conveniently stitching large articles, large machine pulley for great puncturing power, and timely feeding with feed dog and presser foot. It is specially available for stitching multi-layer extra heavy duty material, whether slippery or gummy. It has features of cam thread take-up and large semi-swing shuttle hook with large capacity bobbin to reduce bobbin change. It is an ideal sewing equipment for stitching safety belt, harness, leather trunk, polishing wheel, tent, sail, top cover for car or book binding, etc.