This 18 1/2 inch square features easy to read black and white markings printed in 1 inch grids marked in 1/8 and 1/4 inch increments. 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. 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 Scan the QR Code printed on the ruler to view a video demonstration of these features..Total Size 18 1/2in x 18 1/2in.Made in the USA International products have separate terms, are sold from abroad and may differ from local products, including fit, age ratings, and language of product, labeling or instructions.