"MATL CARBIDE AND STEEL,PRECISION GROUND SURFACE,INCLUDING HELICAL AND COMPOUND ANGLES,INNER AND OUTER BUTTRESS LOCATOR DATUMS AND REAR INNER FLANGERADIAL LOCATOR HOLES;RQRD TO FACILITATE SQUARE INCH AREA CALIBRATION OF COMPUTER ENHANCED OPEN AREA OF FIRST STAGETURBINE VANE GAGE;ITEM IS A MASTER;6.3IN. HT BY 2.5 IN. WD;SERD 1586"