Couching Foot Set Couching is a decorative threadwork technique in which threads, yarns, or other fibers are laid across the quilt and fastened in place by the machine's quilting thread. The three sizes of couching feet in this kit enable you to couch a wide variety of threads, yarns, ribbons, and other fibers to add a special touch to your quilts. Your machine should already be fitted with the mount that works with the interchangeable hopping feet. BLQ-HFK may be required on some models. Product includes: 1.5 mm couching foot. 2 mm couching foot. 3 mm couching foot. Screw.