Use this 45 -degree kaleidoscope rule to cut patterns created with eight triangular units with 45 distinct degrees such as kaleidoscopes and dresde plate blocks. These triangles can also be reconstructed in a sawtooth border. Cut triangles up to an 8 -inch finished height to assemble blocks measuring up to a 16 -inch finished size. A 1/4 inch dotted line is printed on each side of the central vertical line so that you can cut triangles of 22-1/2 degrees which include the seam margin. What a pressure is applied. Then, our exclusive coating keeps the fabric in place during the cut, eliminating the landslides and the missed cuts! The rule is delivered with instructions in English completely illustrated step or scan the QR code printed on the rule to see a video demonstration of these features. Total tail-7-1/4in x 8-1/2in (or 18.41 cm x 21.59 cm).