Pin Gauge Set,ZZ,Minus,1.31mm-4.99mm,185 pcs., Material Steel, Diameter Increment 0.02 mm, Diameter Range 1.31 mm to 4.99 mm, Gauge Type No-Go (Minus), Overall Length 2 in, Tolerance +/-0.005 mm, Hardness RC 60-65, Included Certification Certificate of Accuracy, Standards NIST, Dimension Type Metric