This stitch is also known as a stitch in the ditch foot it makes stitching in the ditch easy and accurate. It is used to sew in the seam line. Top stitching works very well with this foot. It is also used for joining. This is a foot that is used to stitch trims to edges in Heirloom sewing . Beautiful decorative stitches can be made between the trims and the fabric edge at the same time joining them.