This tool is used for holding workpieces during milling, and it is also useful  during layout.  

The angle plate is 120 mm wide and 120 mm deep.   The material is mild steel, 22 mm thick.  The plates  are perpendicular, so the tool can be used as a square.

      << Making prodedure of the Angle Plate is here>>

The below photograph shows one application of this very versatile tool.