Dynabrade 13509 Dynastraight Finishing Tool, Rear Exhaust, 6,000 RPM, 5/8" (16 mm) or 1" (25 mm) Dia. Arbor 
Insize 4644-1N8, NPT THREAD PLUG GAGE, 3-1/2x8NPT, 6928640346927
$670.65
NPT THREAD PLUG GAGE, 3-1/2x8NPT
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