"MATL CARBIDE AND STEEL,PRECISION GROUND SURFACE,INCLUDING HELICAL AND COMPOUND ANGLES AND INNER AND OUTER BUTTRESS LOCATOR DATUMS W/CONVEX AND CONCAVE AIRFOIL SECTION DATUMS;4.9 IN. LG BY 2.2 IN. WD BY 5.4 IN. HT;4 LBS;MASTER IS RQRD TO FACILITATE SQUARE INCH AREA CALIBRATION OF COMPUTER ENHANCED AREA OF SECOND STAGE TURBINE VANE SERD 1588"