Guidelines 4 Quilting Tools help you prepare yourself, your sewing machine, and your fabrics for perfect piecing. Ruler Additions- 3 piece set. Attach these color coded additions, with their suction cups, to the edge of any of your 12" acrylic rulers and Forget-the-Fractions. Pieces marked "S", "H", and "Q" and when attached they will perfectly add 1/4" seam allowances around Squares, Half & Quarter Square Triangles. Built-in finger guard. 8 page instruction booklet included.