The measurement this foot provides is closer to a true 1/4″.
The difference between the Patchwork 1/4 inch foot versus the one with the little black guide on the side, is that this one has the additional guide for patchwork and the 1/4″ seam is based on the right edge of the front toe – perfectly in line for a 1/4″ seam throughout your entire project. This foot also has two red marked guides perpendicular to the seam being stitched.
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)
SNAP-ON: for use with the low shank snap-on adapter
The video tutorial will show and compare all the different 1/4″ feet that we carry: