Cut 30 and 60 degree angles – up to a finished height of 12 inches. This 60 degree equilateral triangle features easy to read black and white markings. A 1/4 inch dashed line is printed on each side of the center vertical line so you can cut 30 degree triangles that include the seam allowance.Use the easy-to-read, black numbers (printed on white dots) and the 1/4 inch grip sides to cut whole inches. The 1/4 inch dashed lines printed on two adjoining sides aid in trimming seam allowances.Use the patented Turn-A-Round feature – designated by the easy to read, numerical white numbers (printed on black dots) and the 1/2 inch grip sides – to add the 1/2 inch seam allowance. The ruler slides easily over the fabric until pressure is applied. Then, our exclusive gripper holds the fabric in place while cutting, eliminating slipping and miss-cuts!A 45 degree angle is printed in black and is used to trim half-square triangles to size. White horizontal and vertical lines are printed on the square so the center of the ruler is easily distinguishable. Use these lines to square up blocks based on four-patches or embroidered and appliqued blocks. Creative Grids products are made in the USA and sold in independent quilt shops only.