The Shape Cut Plus 12″ x 18″ slotted ruler will allow quick and accurate cutting of many different quilting shapes. Simply place the ruler on fabric edge using the grid lines for alignment and use your rotary cutter in the precision cutting slots. Cut strips in 1/2″ increments from 1/2″ up to 18″. Rotate your Shape Cut Plus and cut across the strips for squares. Package insert has complete instructions for cutting triangles, diamonds, bias strips and fringe.