Mayes 10231 SQUANGLE,CARDED Mayes' Squangle is a full 10 tools in one! It incorporates all the features found on a rafter angle square. Thumbscrews tighten for angles of 45 to 90 degrees, and the level vial is virtually unbreakable. The Squangle comes with instructions. No matter what the job is, Mayes helps make sure it's done on the level. Mayes is committed to making the best tools for the skilled professional tradesman who demands the best.