Mayes 13-1/2 in. L X 1-1/3 in. H Aluminum All-Purpose Square

The Mayes squangle is the world's only 10-in-1 tool, incorporating all the features of a square, rafter square, protractor, level, T-square, sight plumb, straight edge, layout jig, pitch finder and ruler. Thumbscrews tighten for angles of 45 to 90 degree and the level vial is virtually unbreakable. The squangle comes with instructions.