Measure, mark, fold, press: deep hems, long hems, miter corners and curved edgings. Heat resistant, press directly on the ruler. Can be used with a dry or steam iron. A unique non-slip surface holds the fabric in place for precise results. 12" x 4". How to Use: - Fold the fabric over the ruler, match the edge to the width needed, press to crease and hold position - Fold corner to match miter line, press or use pen to mark - Use a ruler to mark hem size, place the ruler at the mark, fold fabric, and press to crease and hold position - Use before sewing to check seam width and adjust needle or presser foot as needed to sew accurate seam