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Manufactured under carefully controlled conditions allowing for the highest degrees of accuracy when used at a temperature of 68 degrees F. ( 20 C). All gage block sets are assigned serial numbers and are accompanied with a certificate of inspection listing the deviation for each block DIN861 Grade 2 = +/- 0.000050" Surface Hardness: HRC 64 All gage block sets are made to special standard to resist corrosion and defacement