Most sewing machines these days only come with a few accessory feet. And most zippers are the invisible kind, if you go to the sewing store--that's what you'll find. Plus, invisible zippers look so wonderful when sewn in--they become part of the seam. However, if you struggle with sewing them, the invisible zipper foot is what you need. The foot snaps onto the shank, and it rides over the center part of the invisible zipper, allowing you to sew close to the nylon coils. That's the key--riding over the raised coils so the stitching is right on the tape in the correct position. This is a must-have for any home sewing you do with zippers.