Starrett 13C 6-Inch Double Square with Hardened Blade
This 6-inch double square from Starrett is popular with machinists, toolmakers, and pattern makers because it has a hardened blade and it's equipped with a level. The bevel blade features an octagon angle at one end and a hexagon angle at the other end. The square head is approximately 3-1/2 inches long, and the face is approximately 9/16-inch wide. This tool is made in the USA.