3M 85492, Scotch Foil Tape 3311-10A, 2.0 in x 10 yd (50.8 mm x 9,1 m), 7010383663 
Insize 2435-E1603, BORE GAGES, measuring depth 30″, range 4.0-6.3″, 6928640391170
$4,943.99
Applicable for .001″ or .0001″ or .00005″ graduation dial indicators.
Carbide contact point and anvil.
Optional accessory: dial indicator or dial comparator, setting ring.
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Insize 6140, DEPTH BASE ATTACHMENT, suitable for calipers with beam width (w) .630″, 6928640303579
$24.78