AMS-224EN(AMS-221EN)X7910 has removed the area where hitch stitches are produced to make the total area capable of sewing with perfect stitches, thereby improving the seam quality. Stitch knot formation has been developed so that the needle thread and the bobbin thread are at proper right angle resulting in flawless stitches. The machine comes with double-capacity shuttle hook ideally suited for Total-area perfect stitching. This shuttle hook ensures a consistent thread tension be preventing the thread from being untwisted by its rotation.