The Bi-level Topstitch Foot for IDT system guides your topstitching and edge stitching perfectly. The underside of the presser foot is designed to glide along the folded edge, and it will give you beautiful topstitching on your project. Use the Bi-level Topstitch Foot for hemming bulky projects such as waist bands, curtains etc. It will allow you to have the fabric outside the free arm for easier sewing.