NAS 897 Reamers conform to National Aerospace Standards and are used for several reaming applications in the aerospace industries.https://gammons.com/nas-897-chucking-reamersTolerance: +.0002"/-.0000" Part NumberNominal SizeDecimal EquivalentOverall LengthFlute LengthShank Diameter# of FlutesPriceCRSN022102.22106.001.500.21636$41['10CRSN022801']['22806']['001']['500']['21636']$41['10CRSN02340A']['23406']['001']