Carpenters Edge Ruler Carpenters Measuring Tool Ruler Edge Angle MeasurementFeatures:Even the most skilled woodworker faces a challenge in accurate angular placement on larger panel projects. You can try to extend the production line from a small protractor, but even a small error will make the production line extend farther and longer.The secret is a series of precision-machined index holes and spring-loaded, tightly toleranced index pins that engage with them. The pin snaps into place, giving you confidence that it is positioned accurately.Even if you dont use angles, this is a layout tool that can be used in almost every project. The blade has the same unique serration design notch as the woodpeckers new stainless steel precision woodworking grid.The thin satin-finished stainless steel blade is easy to read and minimizes parallax errors. Package contains: 1x woodworking edge ruler