Sew together 12 of these 30 degree triangles to create a complete circle; 6 to create a half-circle; or 3 to create a quarter-circle. Create Fans, Dresden Plates, etc. up to a finished size of 38 inches. Use the vertical lines to fussy cut stripes or cut half triangles (the 1/4 inch seam allowance is marked). Or cut 30-, 45-, and 60-degree units with the angles marked on the ruler. The ruler comes with fully illustrated step by step instructions or scan the QR Code printed on the ruler to view a video demonstration. The ruler slides easily over the fabric until pressure is applied. Then, the exclusive gripper holds the fabric in place while cutting, eliminating slipping and miss-cuts! Total Size, 10-3/4 in. x 19-1/2 in.