Dynabrade 78182 3" Dia. Medium DynaBrite Locking-Type Disc, 25/pack 
Insize 2124-E7, PISTOL GRIP THREE POINTS BORE GAGE, 6-7″, 6928640374623
$1,567.46
Optional accessory: electronic indicators
(part no. 2108-101EF, resolution .00005″/0.001mm),
setting rings (part no. 6313)
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Insize 4809, U.S. STAND SHEET METAL GAGE, 0-36(.3125~.0070″), 6928640330162
$35.18