3M 21639, PSA Cloth Disc 348D, 36 X-weight, 6 in x NH, Die 600Z, 7000148149 
Insize 2425-20, BORE GAGE FOR SMALL HOLES, 12-20mm, 6928640310348
$1,248.38
Applicable for 0.01mm or 0.001mm, graduation dial indicators
Carbide contact point and anvil
Optional accessory: dial indicator or dial comparator, setting ring
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Insize 4809, U.S. STAND SHEET METAL GAGE, 0-36(.3125~.0070″), 6928640330162
$35.18