The 06 Hot Hemmer allows you to Fold, measure, press hems and more in one step. Measure ,mark and press straight hems, round, interior and miter corners. It is heat resistant so that you can press right on the ruler. A thin and accurate ruler that can be used with a dry or steam iron.. It has a unique non-slip surface that holds fabric in place for very precise results. Joan Hawley says " Keep it near the iron to quickly measure , mark or press hem , corners and more".