Trim-Pro Miter Saw Locking Protractor Laser engraved Stainless Steel, Made in USA! "GUARANTEED ACCURATE!!! Turns a miter saw into a precision cutting tool for trim. Install trim with no need for compound miters, or a coping saw, or math. Scale is 2 1/2 times larger than similar tools. Reads accurately to 1/4 degree. Includes detailed 3 page instructions for setting up a miter saw and fitting crown molding.