This patchwork foot is a straight-stitch only and should be used only with center needle position. A narrow groove under the flat sole serves as a thread channel for smooth piecing. The small needle opening helps prevent fabric from being pulled down into the feed dog when stitching narrow seams. The patchwork foot features three evenly-spaced marks along each side. One marks the needle position, one is 1/4" in front of the needle, and the other 1/4" behind the needle. This provides easy visible reference points for stopping and starting 1/4" from an edge or corner.