JUNE TAILOR-Square up 2 sizes of quilt blocks with 1 ruler using just 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" and magenta = 1/8". 45 degree markings to visually square block designs.