Features: 1. The head can be adjusted from 0 to 70 and fixed every 5 times (+22-1/2 and 67-1/2) to give you an accurate reference angle and length respectively. Close tolerance indexing pins. The pin snaps into place, giving you confidence that it's in place. 2. Both edges of the blade are engraved with 1/32" inch graduations. regular raises 3. The ruler has a total cumulative error of .004" over the length of the blade. 4. Almost any project can be done. Saw blades have the same special teeth. 5. There are notches every sixteen inches throughout the blade. 6. Just place the pencil in the notch and slide the tip along the edge of the pencil to get a perfectly parallel line. Description: Name: Woodworking Ruler Material: metal Color: silver Size: 10 inches, 15 inches, 20 inches Measuring range: 0-70 degrees Measurement accuracy: 1mm Type: square Packing list: 1 x Woodworking Ruler Note: Different displays may cause the color of the item in the picture a little different from the real thing. Manual measuring,please allow 1~3mm error,thank you. Unparalleled Accuracy: Our latest precision scales deliver unrivaled precision for your panel layout work. Simply press the head to the desired angle and press in a straight line. Thin satin-finished stainless steel blades are easy to read and minimize parallax errors. The perfect layout tool for woodworking: Even if you don't use angles, this is a layout tool. Design line notches are found in our new Stainless Steel Precision Carpentry Grilles.