3M 463-000-TRI-4, Pro Grade Precision Comfort & Performance Large Sanding Tool, 3.7 in x 7 in, 7010416697 
Dynabrade 98272 1/2" NPT Female Plug 
Insize 4131-5D2, AMERICAN STANDARD THREAD PLUG GAGE, 5/16-24UNF, 6928640358975
$87.51
Class 2B.
Standard ANSI/ASME B1.2
Supplied with Go and No-Go gages together
Supplied with manufacturer inspection certificate.
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