DESC: The 72-stitch-function XL-3510 sewing machine features an easy automatic 4-step buttonholer with stitch balance control for perfectly uniform buttonholes every time. It also has conveniences such as an automatic needle threader and automatic bobbin winding system. Lightweight with a built-in handle for portability, the XL3510 is a truly versatile machine that will be enjoyed by both the sewing and quilting enthusiast.