Dynabrade 53533 Cone or Plug Grinder (Triple Extension) 
3M 77737, ROLOC DISC PAD TS AND TSM, EXTRA HARD, 3 IN 1/4-20 INTERNAL, 7010299209 
3M 28473, Roloc D/F Cool Running Disc Pad TR, 4 in x 5/8-11 Internal, FIN, 7000144107 
Insize 7352-E500, LONG HANDLE, 6928640357190
$887.27
To assist deep-hole measurement.
Can be used for bore gages 2422, 2428, 2423 and 2424
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