Standard Abrasives 877066, Unitized Mounted Point, 821 B42 x 1/8 in, 3M 7100055542 
Insize 2124-E035, PISTOL GRIP THREE POINTS BORE GAGE, .275-.35″, 6928640374470
$590.94
Optional accessory: electronic indicators
(part no. 2108-101EF, resolution .00005″/0.001mm),
setting rings (part no. 6313)
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Insize 6140, DEPTH BASE ATTACHMENT, suitable for calipers with beam width (w) .630″, 6928640303579
$24.78