This is definitely the ziz zag foot for the straight stitch singer or Phaff machine. The ruffler has a longer body and extra slides to place the fabric in. this one has the 2 slots to hold the fabric each in its own place to feed thru to the needle. this one swings side to side. The ruffler/pleater slid front to back and made the prettiest ruffles. I think I still may have it around in some of my nostalgic sewing stuff.