Dynabrade 13509 Dynastraight Finishing Tool, Rear Exhaust, 6,000 RPM, 5/8" (16 mm) or 1" (25 mm) Dia. Arbor 
Insize 2237-5, INTERNAL THREAD CREST DIAMETER MEASURING INSTRUMENT, 2 3/8″-5 1/2″/60.325-139.7mm, 6928640384677
$4,976.56
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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