Cut together 36 of these 10 degrees triangles to create a complete circle; 18 to create a semicircle; Or 9 to create a quarter of a circle. Create fans, dresde plates (Dresden Plate), etc. Up to a finished size of 31-1/2in (80 cm). The total length of the rule is 16 inches (40.64 cm). The rule easily slides on the fabric until pressure is applied. Then, our exclusive coating keeps the fabric in place during the cut, eliminating the shifts and the missed cuts! Delivered with English instructions completely illustrated or scan the QR code printed on the rule to see a video demonstration. - 3-1/4in x 16in (or 8.25 cm x 40.64 cm).