The CurveMaster Presser Foot makes sewing curves almost as easy as sewing a straight seam. Its designed to guide fabric for curved piecing, allowing automatic easing of curved seams. No more measuring, pinning, or clipping! Execute the curved seams of Apple Core, Drunkards Path, Double Wedding Ring, and other patterns with ease. CurveMaster easily attaches to your sewing machine – just place under the shank and snap into place.