Measure, mark, fold, and press hems and more in one step: Use the Hot Hemmer Square for pressing all sizes of Dresden wedges for Dresden quilt blocks, pressing under edges of quilt block appliques and, geometric appliques for quilting, hemming, and miter corners. It is heat resistant, so you can press directly on the it. Thin and accurate, the ruler can be used with dry or steam iron. The unique non-slip surface holds fabric in place for precise results. 6" square.