This Triangle in a Square ruler features a 2 to 1 ratio to cut proportional Triangle Squared blocks that finish to 9 inches. Use these triangles to piece a saw tooth border or use it as a companion to the Perfect Rectangle ruler (Item CGRTMT3) to create Perfect Triangle in a Square 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! The ruler comes with fully illustrated step-by-step instructions or scan the QR Code printed on the ruler to view a video demonstration. Total Size - 9-1/2in x 9-3/4in