Stitch in the Ditch Tool
This tool is designed to be used with a Quarter Inch Presser Foot on a standard machine. Can also be used on a longarm machine that has a hopping foot that has a 1/4in between the needle and the edge of the foot. Test your foot by doing some stitching on a scrap piece of fabric. One side guides for stitch in the ditch, the other side is for a perfect quarter inch.