This is the standard straight-stitch presser foot included with most all vintage Singer Sewing Machines, including the Singer Featherweight 221 and 222K. If you have a Singer Featherweight then you will need to select "low shank" as the style of your sewing machine model. This presser foot is for straight-stitch only. Do not try to zigzag stitch (if using on a zigzag machine) using this presser foot.
LOW SHANK: fits the Singer Featherweight 221, 222K and all low, vertical shank Sewing Machines (i.e. 15, 27, 28, 66, 99, 185, 127, 128, 192, 201, 206, 237, 306, 319, 320, 328, as well as many other brands besides Singer)
SLANT SHANK: fits all SLANT shank Singer Sewing Machines (i.e. 301, 301A, 401, 401A, 403, 500, 503, 600 & 700 Series and all other Slant Needle Singer Models)