1/4" Patchwork Quilting Foot For Singer 221 Featherweight Sewing Machines. Always ensure needle is set to center straight stitch. Align the edge of the fabric with the outer presser foot guide for a seam allowance of 1/4” or with the inner presser foot guide for a seam allowance of 1/8". There are also marks at a 1/4” spacing at the front and back of the presser foot, allowing you to see the width of the seam allowance before and after the needle entry. Fits Singer models : 15-91, 185, 201, 221 Featherweight, 222, 222K This presser foot is used for piecing together patchwork with a seam allowance of 1/4" (6.4mm) or 1/8” (3.2mm)