3M 82975, Roloc D/F Cool Running Disc Pad TR, 3 in 1/4-20 Internal, 7010309116 
Standard Abrasives 712768, A/O Tapered Cone Point, C-30 80, 7100119537, 100 per case 
Insize 1121-5001, DIGITAL INSIDE POINT CALIPER, 60-500mm/2.36-20″, 6940561936865
$782.43
Resolution: .0005″/0.01mm.
Measure groove diameter.
Buttons: on/off, set, inch/mm, preset (+, -).
Automatic power off, move the digital unit to turn on power.
Battery CR2032. Data output.
Made of stainless steel.
Optional accessory: depth stop (part no. 6143), data output cable
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