Bore Gauge Indicator Magnetic Base Thickness 10Mm Screw 25.4 0.001 Support Inch Depth Dial Indicators - AliExpress
52-646-400-0 Gauge Measurement Tool Extender Cylinder Dial Bore Gage Set with 1.4-6" Measuring Range Measuring Depth of 9.5", 0.0005" Graduation Dial Bore Gage with Portable Case - Yahoo Shopping