Take the math out of cutting half-square triangles (adding 7/8 inch to the finished size of half-square triangles). Solid black lines are marked at 7/8 inch, 1-7/8 inch, 2-7/8 inch, 3-7/8 inch, 4-7/8 inch and 5-7/8 inch so it is easy to cut the squares and strips needed to create half-square triangles that finish 1 inch to 5 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! The ruler comes with fully illustrated step by step instructions or scan the QR Code printed on the ruler to view a video demonstration.