3M 9450, Disc Pad Holder 917, 7 in x 5/16 in x 3/8 in 5/8-11 Internal, 7000028549 
Insize 2433-E300, INTERNAL GROOVE BORE GAGE, 7.1-11.8″, 6928640379079
$10,736.20
Measure diameter of internal grooves (width of groove _3mm)
Anvil is needed
Optional accessory:0.01mm or 0.001mm graduation dial indicators, setting ring
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