The new woodworking edge ruler simplifies your life by enclosing the edge of the workpiece and providing precise proportions on both sides. Even the most experienced woodworker faces challenges with precise angle placement on larger panel projects. You can try to extend the production line with a small protractor, but even a small error will result in a larger error the larger the production line. Our brand new precision ruler offers unmatched precision for your panel layout work. Simply slide the head to the desired angle and then straight out. The secret to the T-Square is the series of precision-machined indexing holes and the spring-loaded, close tolerance indexing pin that connects them. The pin locks into place, giving you the confidence that it's just right.