Sew together 16 of these 22 1/2 degree triangles to create a complete circle; 8 to create a half-circle; or 4 to create a quarter-circle. Create Fans, Dresden Plates, etc. up to a finished size of 18 inches. Total ruler length is 9-1/2 inches. The ruler slides easily over the fabric until pressure is applied. Then, our exclusive gripper holds the fabric in place while cutting, eliminating slipping and miss-cuts! Creative Grids Rulers have a MAP (Minimum Advertised Pricing) Policy.