Dynabrade 77760 4-1/2" Dia. x 7/8" Center Hole, 120 Grit, Z/A, Type 27, DynaCut Flap Disc W/Fiberglass, 10/pack 
Insize 2124-E0425, PISTOL GRIP THREE POINTS BORE GAGE, .35-.425″, 6928640374487
$577.94
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