The Left Edge Topstitch Foot guides your top stitching and edge stitching perfectly. Use can use the inner right side of the presser foot to guide the fabric. Together with the underside of the foot which is made to glide along the folded edge, you will get a perfect top stitch on your project. Use the Left Edge Topstitch Foot for hemming bulky projects such as curtains, etc. It will allow you to have the bulk of the fabric to the left of the free arm for easier sewing.