Creative Grids Dresden Ruler is an 18 degree wedge and includes a circle for the center. It makes a 20-petal round or pointed Dresden Plates from strips with no waste of fabric. Each petal can be cut up to 8-1/2 inches to create Dresden Plates up to 16-1/2 inches. The rulers slide easily over the fabric until pressure is applied. Then, our exclusive gripper holds the fabric in place while cutting, eliminating slipping and miss-cuts!