Quilt Strip Piecing Guide by O?lipfa Want straight, accurate quarter inch seams? Try this new product from O'lipfa. It is an adjustable clear plastic guide that attaches to the base of your sewing machine with reusable mounting squares. Simply line up the guide with the desired seam allowance. Feed your strips through the guide and your seams are straight and even! This product is unique and easy to use; and is a real time saver!