Measuring and pressing hems, folds, or pleats is so much faster with this ironing ruler. Just fold using the grids and confidently iron on the ruler to press your seam allowances from ⅛ inch through 2 ½ inch, or even 10 inch if you turn this hot hemmer. Doesn’t this make preparing your sewing project much easier? Reduce your sewing time while still making precise hems! Specifications Made out of felted wool * Heat resistant. Press directly on the ruler, with or without steam. This material doesn’t heat up * Non-slip. This stiff felt material holds fabric in place perfectly * Lightweight Has clear grid lines * Lines for all commonly used hems from ⅛ inch to 10 inch * 45° grid lines to press mitered corners * Accurate Dimensions * 10 inches long x 2.