Plug Gage,Go Type,Class X,0.3980in. dia.
4000 in, Dimension Type Inch, Gauge Type Go (Plus), Included Certification Certificate of Accuracy with NIST Traceability, Surface Finish 4 Microinch or Better, Tolerance 0.3980 in, Diameter Increment 0.4060 in, Diameter Sub-Range 0.00004 in, Tolerance Class X, Hardness RC 60/65, Long Form Calibration Certificate No, Overall Length 2 in, Standards ISO 17025.