The Bernina Zipper Foot #14D produces perfectly parellel lines of straight top stitching and is ideal for the professional insertion of zippers. It resembles standard Zipper foot # 4, but features an added bar across the top of the foot which serves as a guide. Owing to its wavy shape, this adjustable Bernina Zipper foot #14D with Guide rides right over the coils of the zipper. The result is a neat, evenly inserted zipper.