3M 33446, Cubitron II File Belt, 80+, 1/2 in x 18 in (12.7 mm x 457.2 mm), 7100033186, 10 belts per carton, 5 cartons per case 
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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Insize 6140, DEPTH BASE ATTACHMENT, suitable for calipers with beam width (w) .630″, 6928640303579
$24.78