This Janome Concealed Zipper Foot for 9mm Models is compatible only the Janome machines that sew a 9mm stitch. Good quality ready to wear garments will often have an invisible zip fitted. These zippers are often neglected by the home dressmaker which is a pity because they can ensure success every time. Invisible zips are suitable for all fabrics from fine silk jersey through to suit weight wools and tweeds. The key is to get the needle as close to the fastener as possible, which this foot accomplishes by slightly unrolling the zipper just before the needle. Once fitted, a well sewn invisible zipper will merely look like part of the seam.