I have an Easy Dresdent Ruler which allows you to cut blades any size up to 8 inches. I love it. I recently was practicing with it for my upcoming Dresden Plate quilt and cut blades at 3.5 inches. These are now on a hot pad that is 8.25 inches square finsihed. The blade tips are about 1/2 inche from the binding. I would say it could've been set on a 12 inch block if you wanted.