This guide is used for setting the folded width of the fabric and the stitching position for cover-stitching. This guide can set the folded width of the fabric and align the edge of the fabric from the backside, where it is difficult to see the cover-stitching. First, fold the fabric to the width that is to be sewn and then adjust the guide according to the width of the fold. This guide is perfect for finishing pants and sleeve hems of clothes.