Professional Miter ProtractorThis Professional Miter Protractor eliminates calculations, reduces errors and provides greater accuracy for a miter cut. It is easy to use by just simply set your saw to the angle shown on the protractor. Upside down or backward, the reading is always correct. The miter cut arrow and inner scale indicate the exact miter saw setting for an accurate miter joint every time. The single cut arrow and outer scale indicate the exact miter saw setting for