3M 26137, PPS Series 2.0 Adapter, Type S41, Trapezoidal Thread - QCC, 7100135947 
Insize 2318-25, DIAL INDICATOR, 25mm, graduation 0.1mm, lug back, 6928640312434
$102.24
Supplied with limit pointers and bezel clamp.
Optional accessory: backs, contact points.
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