This patented tool was developed from the ground up. The protractor is the base design of practically every miter guide made. It is also the single main source of the problems encountered when crosscutting. We discarded the entire protractor concept. In our engineering of the application of our patent we wanted most of all to keep the guide simple. It had to be rock solid and easily set to very accurate angles over and over. The triangle was the obvious answer to the stability issue. No geometric shape is used more to straighten and stabilize components than the triangle. Pythagoras had it right. We put an abrasive face the front of the fence, which absolutely prevents any movement of the work piece during the cut. This guide is extremely accurate right out of the box. Simple solutions are always best.