These machines are equipped with walking foot, needle feed and feed dog, all of which act completely in unison, consequently, the upper or lower sewing material does not slip and also these machines can sew accurately and easily several sheets of heavy-weight materials piles up together. Standard needle gauge: 6.4mm. Automatic lubricating system, smooth and quiet running, easy maintenance. Large hook to assure high efficiency, perfect stitch. These machines are best suited for sewing tents, seats, cushions, bags, leather products, interior furnishings of automobiles, etc.