3M 47111, Cubitron II Hookit Clean Sanding Film Disc 775L, 320+, 3 in, Die 300DS, 7100145433, 250 per case 
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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Insize 6144, ACCESSORY SET FOR DIGITAL CALIPERS, 6928640380839
$83.88