1. The scale can be adjusted from 0 to 70 and fixed every 5 degrees (22-1/2 and 67-1/2) to provide an accurate reference angle and length. Close tolerance indexing pins snap into place for secure positioning. 2. Both edges of the blade are engraved with 1/32 inch graduations. 3. The ruler has a total cumulative error of .004 inch over the length of the blade. 4. Suitable for a wide range of projects. 5. There are notches every sixteen inches along the blade. 6. Simply place the pencil in the guide and slide the tip along the edge to draw a perfectly parallel line. Color: As Shown Material: Metal Size: 20 Inch Package Contents: 1 x Woodworking Ruler Note: Light reflection and different displays may cause the color of the item in the picture to appear slightly different from the actual product. Measurement allowance is +/- 1-3 cm.