This 22-1/2 Degree Triangle Ruler by Creative Grids® helps you easily cut wedges for Fans, Dresden Plates, and more. Made in the USA from quality acrylic, it features a non-slip grip for precise cutting and clear black-and-white markings. Use its angled lines and vertical guides for versatile designs and accurate seam allowances. Sew 16 wedges to form an 18-inch circle. Visit the Creative Grids website for tutorials and patterns. Size: 4-1/4" x 9-1/2".