A lightweight and precise triangular square. This multi-purpose square combines the functions of a tri square, combination square and framing square in one. Featuring a 0° to 90° protractor scale for use as a saw guide with embedded degree markings for easy legibility.3 in 1 – combination square, try square and protractor .Maximum accuracy .Mitre square and framing square .Durable etched scales for ease of visibility .Calculate angles of roof frames quickly and easily.Built-in notches for scribing.