The SINGER Roller Snap-On Presser Foot for Low-Shank Sewing Machines The Roller Foot can be used to sew thicker fabrics, napped fabrics, heavy knits, leather, vinyl, or any heavier weight fabrics that are difficult to feed. The foot has two sets of rollers, one large in the front and two small in the back of the foot, to allow fabrics to pass under the foot smoothly. The Roller Foot can be used in place of an All-Purpose Foot with the added benefit of feeding most heavier weight fabrics that are difficult to sew. Tip: use a paper clip instead of a straight pin to keep fabric together. Roller Foot is perfect for sewing napped fabrics, thick fabrics, heavy knits, vinyl, leather & more. Use the Roller Foot when sewing heavy knits and napped fabrics. To sew heavy knit fabrics with the Roller Foot use a narrow zigzag stitch or straight stitch. Tip: Increase your stitch length when sewing with the Roller Foot. Perfect for burlap and paper crafting.