Creative Grids Perfect Rectangle ruler features a 2 to 1 ratio to cut proportional half rectangles up to a finished height of 9 inches. Piece perfect pieced rectangles or use it as a companion to the Triangle in a Square ruler (Item CGRTMT2) to create perfect Triangle in a Square blocks. 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.