This 1-1/2" x 12-1/2" rectangle ruler features easy-to-read black and white markings printed in 1" grids marked in 1/8" and 1/4" increments. Use the easy-to-read numbers and 1/4" grip side to cut whole inches and trim seam allowances. Use the patented Turn-A-Round feature and the 1/2" grip sides – to add the 1/2" 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 miscuts.