Precise Precision Granite Squares

• For inspecting squareness
• Grade A Flatness and beeline of the measuring surface 0.0001/6, flatness and beeline of the standard surface 0.0001/6, perpendicularity between measuring and standard surface 0.0001″/6″
• Round hole for less weight and easy handling
• Includes calibration sheet
• With holes which reduce the weight.