Pin Gauge Set,ZZPlus,.833 in-.916 in,84 pcs., Material Steel, Diameter Increment 0.001 in, Diameter Range 0.8330 in to 0.9160 in, Gauge Type Go (Plus), Overall Length 2 in, Tolerance +/-0.00020 in, Hardness RC 60-65, Included Certification Certificate of Accuracy, Standards NIST, Dimension Type Inch