Janome Adjustable Zipper / Piping Foot - Category A/B can be adjusted to sew on each side of a zipper. The edge of the foot guides the zipper to ensure straight placement. This screw-on type foot can be adjusted to fit snugly against cord when covering your own or attaching commercial piping and will be invaluable when used to stitch thicker piping that won?t fit the ?Piping Foot? including heavy jumbo cord.