This is Midwest's Hobby and Craft Square.
A must for every hobbyist.
+Additional Technical Information Will Be Added As It Becomes Available. ++
Built-in ledge for fast markings
Strip and dowel identification gauges
90° square for perpendicular assemblies
40° edge with built-in protractor in 5° increments, and a 4" ruler
with metrics too.
One Hobby and Craft Square.