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 CGRTMT3 to create Perfect Triangle in a Square blocks. The ruler comes with fully illustrated step-by-step instructions or scan the QR Code printed on the ruler to view a video demonstration. The ruler slides easily over the fabric until pressure is applied. Then, the exclusive gripper holds the fabric in place while cutting, eliminating slipping and miss-cuts!