The new Carpenter's Edge Ruler simplifies your life by wrapping around the inventory edge and ensuring precise proportions on both sides. The secret to the T-shaped square is a series of indexing holes that are precisely machined and made to tight tolerances, with spring-loaded index pins locked into them. The pin locks into place, giving you the confidence that it is precisely positioned. Even the most experienced carpenter faces the challenge of accurately placing the angle on a large panel project. You can try to extend the production line with a small protractor, but even a small error will cause the production line to extend further, the larger the error. Our newest precision ruler can deliver unprecedented precision for your panel layout work. Simply push the head to the desired angle and then push it straight. The head adjusts from 0° to 70° and locks firmly every 5° (plus 22 -1/2° and 67-1/2°) to give you accurate reference angles and lengths, respectively. It measures 10