3M 45098, Roloc Disc Pad TR, Soft 1-1/2 in 1/4-20 Internal, 7000045277 
3M 5677, DISC PAD HOLDER 914, 4 IN X 1/8 IN X 3/8 IN M14-2.0 INTERNAL, 7010299278 
Insize 2237-5, INTERNAL THREAD CREST DIAMETER MEASURING INSTRUMENT, 2 3/8″-5 1/2″/60.325-139.7mm, 6928640384677
$4,896.46
Dial indicator graduation 0.01mm
Accuracy 0.02mm
Measure the crest diameter of internal thread with nominal diameter larger than 2 3/8″(60.325mm) and less than 20″ (508mm)
Optional accessory: height standard and zero standard block
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