Rectangular Gauge Block, Long Form Calibration Certificate No, Material Steel, Application Grade Inspection, Dimension Type Inch, Grade AS-1, Included Sizes 6 In., Number of Pieces 1, Shape Rectangular, Tolerance 8 microinch, With Hole Yes, Case Type Wooden Case, Included Certification Certificate of Inspection, Includes 6 In.�� Supplied with manufacturer inspection certificate, Wooden Carrying Case, Standards ASME B89.1.9