Dynabrade 78581 1/4" Dia. x 1" W x 1/8" Center Hole, 120 Grit, 100/pack 
Insize 2433-E180, INTERNAL GROOVE BORE GAGE, 4.7-7.1″, 6928640379062
$9,024.35
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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