Description 1The head can be adjusted between 0~70, and each 5 is firmly locked (plus 22-1/2, 67-1/2), providing you with an accurate reference angle and length. 2Our precise ruler can provide unparalleled accuracy for your panel layout work. Just press the head to the desired angle, and then press a straight line. 3A series of accurately machined index holes and spring loaded, close tolerance index pins. The pin snaps into place, so you can rest assured that its position is accurate. 4Woodworking edge rules can also be used as hook rules. The two edges of the blade are engraved in 1/32 inch increments. It is very easy to read and minimizes parallax and errors. 5The blade has a unique serration design. There will be a blank every 16 inches across the blade. Just put the pencil in the blank and slide the head along the pen slot to get perfect parallel lines.Item Type: Woodworkers Edge RuleMaterial: Stainless Steel, ABSPurpose: Woodworking Edge Angle Measurement ToolColor: Silver, Red, BlackMeasuring Range: 0-70Measurement Accuracy: 1mmType: Angle Ruler 1 xWoodworkers Edge Ruler1 x Black Auxiliary BoardThe cumulative error measured over the blade length is .4 inches.