Pin Gage Set,ZZ, Plus,.006 in-.06 in,55 pcs., Material Steel, Diameter Increment 0.001 in, Diameter Range 0.0060 in to 0.0600 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