The Vtg Singer 160506 Buttonholer is a high-quality accessory designed specifically for Singer Featherweight 221 sewing machines. This buttonholer, made in the United States, includes 5 templates for creating perfect buttonholes. It is compatible with lock stitch low shank machines, making it a versatile and essential addition to any sewing enthusiast's collection. With the trusted Singer brand name, this buttonholer ensures precise and professional results for all your sewing projects.