With the couching inserts, you can creatively sew yarns, cords, and wool or felt threads on to your project. Enjoy easy couching using either a plexiglass ruler for guidance or the free-motion technique. The inserts are for use with the Adjustable Ruler foot #72 and are attached to the underside of the foot. The use of high-quality materials makes the inserts very strong and protects the surface when quilting with metallic yarns and cords.