This 45 degree triangle cuts half-square triangles up to a finished size of 8 inches. Since the tip is trimmed, all squares and triangles can be cut from the same strip of fabric. A dashed 1/4 inch seam allowance is printed around the entire edge of the ruler. 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!