Pfaff ruffler attachment cat d with the pfaff ruffler you can make closely or widely spaced pleats automatically while sewing this is very useful for ruffles frills home decor etc the ruffler can be used in three different ways folding and securing pleats folding pleats in fabric and securing to a second fabric in one operation folding pleats in fabric attaching lace and securing to another fabric in one operation this foot will fit category d machines