New replacement Greist Buttonholer attachment.
Comes complete with instructions, feed cover, templates and attaching screw.
Will fit most all low shank machines including Singer models: 15, 66, 99, 201, 221, 206, 237, 239, 242, 247, 248, 252, 257, 306, 319, 327, 328, 329, 337, 338, 347, 348, 353, 360, 413, 418, 457, 476, 477, 478, 513, 533, 534, 543.