Around the Block Ruler, 8" x 8": * Square up 2 sizes of quilt blocks * Using just ruler and a rotary cutter * No need to mark or trace * 1/4 seam allowances on all sides-interior and exterior * Teardrops allow for complete corner cut of interior square * 3 color grid markings for easy-to-read dimensions * Black: 1 and 1/2 * Teal: 1/4 * Magenta: 1/8 * 45 degree markings to visually square block designs