With your new Corner Pop tool, you will be able to trim rather than mark, add an oversized replacement triangle and then square everything to a perfect size. In twenty two different sizes - whole, half and quarter inches. Increased success without undue stress for every level of quilter. What's not to love! Ruler size: 9½" x 9½". Twenty two size options: from ¾" to 6" finished size in quarter inch increments.