The “Featherweight Accurate Seam Guide” Fits the Singer Featherweight 221, 222, as well as most other vintage Singer models (ie 15, 66, 99, 127, 128, 185, 201, ZJPK7DE, etc.) 3/16″ thickness, and the acrylic helps protect the machine bed from scratches. Featuring the sweet gold decals on a black surface to match the classic featherweight design. Includes screw and washer for seam guide stability and consistent, accurate seams (but easy to unscrew if necessary). Use a small ruler to measure and slide the guide to achieve a wide range of seam allowance preferences — from a small 1/4 inch (1/4″) seam, a true quarter inch seam, and more! We love the gold filigree that goes with the old Celtic knot decals — don't you agree it's as cute as can be!?!