Rectangular Gauge Block, Long Form Calibration Certificate No, Material Steel, Application Grade Working Reference, Dimension Type Inch, Grade AS-1, Nominal Size 0.5 in, Shape Rectangular, Tolerance 6 microinch, With Hole No, Face Length 1 3/8 in, Face Width 23/64 in, Included Certification Certificate of Inspection, Includes Certificate of Inspection, Standards ASME