McCall's Quilting website also has a free video tutorial that shows how to do this. I used it to make bias binding for an 80x80 inch quilt that has a scalloped border. It is like magic to me! I really think I used a 30 inch square of fabric to make all that binding. I'm not at home, so can't look it up for sure. It was my first scalloped border and first bias binding. I love how it turned out, made it for my DD and she loves it, also.