This foot has a wide variety of uses in decorative work, including embroidery, appliqué, satin stitch, monograms, quilting and cut work. The front of the foot is open, giving clearer visibility The bottom of the foot has a wedge shaped indentation, which allows even satin stitching to glide under the foot without dragging. The angle in the indentation makes it possible to turn curves easily The toes of the foot are shorter, compared to a regular zigzag foot, for greater maneuverability while sewing (you can turn the fabric more easily for smoother stitching lines, an important asset when embellishing fabric) On 9mm rotary models, Foot #20C (9mm) allows the use of the wider decorative stitches these machines offer.