This foot is ideal for topstitching, hemming and embellishing. It's special guide blade helps you sew perfectly straight seams. Superbly suited to applying lace and trims, ideal for topstitching edges, pleats and hems. The guide blade in the centre of the foot helps you sew perfectly parallel to the edge in next to no time. This centre guide is also a great help when "stitching in the ditch" helping you achieve great accuracy and an almost invisible stitch line.
See here for a great tutorial on how to make the most of this foot.