Fowler 52-472-104-0 Blind Bore Style Small Hole Gage, .125-.5" Range – Ideal Precision Instrument Service, Inc.
Mitutoyo Small Hole Gages, .393"-.511" | AFT Fasteners
Telescopic Gauge, High Accuracy 4Pcs Bore Measuring Tool Full Ball Gauge for Measure Small Holes for Grooves for Slits: Amazon.com: Industrial & Scientific
Diatest Bore-Hole Gage 1/16 to 5/32", Small Hole (1.588-3.9mm) » ToolingCrib.com
BORE GAGE FOR SMALL HOLES, .24-.4"|TestEquipmentUSA
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4PCS Bore Guide Hole Gage Set Small Hole Gage Small Bore Gauge Small Hole Gauge | eBay