This 8-1/2" 60 Degree Triangle Ruler from Creative Grids provides everything you need to cut 30 and 60 degree angles up to a finished height of 8". This 60 degree equilateral triangle features easy to read black and white markings. A 1/4" dashed line is printed on each side of the center vertical line so you can cut 30 degree triangles that include the seam allowance. The ruler slides over fabric until pressure is applied. Then, its grip feature holds the fabric in place while cutting, eliminating slipping and miscuts.