This is a basic 8" ruler. There are two files for this make. The first, the basic ruler, has slots so you can use a mechanical pencil to draw small lines for marking measurements and it allows you to see llines at that mark. However, the first one cannot be used as a straight edge tool. So, the secong make, is an edged ruler. It closes the gap between the measuring marks. You do not need to print both. choose whichever is more conveniant for your purposes.