"4.500 IN. W,5.500 IN. L,2.500 IN. H; 2 LB; MATL:BOLTARON/WASPALOY; PROBE DIA: 0.398 AND 0.630 IN.; USED IN EDDY CURRENT INSPECTION TO DETECT FLAWS IN THE 7TH,9TH,11TH,& 13TH COMPRESSOR DISK HOLES; MAUFACTURES SUGGESTED NAME GAGE STANDARD,PROBE CALIBRATION"