Vintage Singer sewing machine low shank bias binder / binding foot with the blackside finished shank (many blackside attachments still had silver tone components such as this one). This foot is compatible with low shank machines including the 15, 66, 99, 127, 128, 185, 192, 201, 221 / 222K Featherweight, etc. Very nice vintage condition, clean and rust free. Genuine, original Simanco accessory part #121464.