Standard Abrasives 712149, Aluminum Oxide Handy Roll, P100 J-weight, 1-1/2 in x 50 yd, 7010295370 
Standard Abrasives 712644, A/O Tapered Cone Point, K-110 180, 7100166526, 100 per case 
Insize 1121-1501, DIGITAL INSIDE POINT C, 35-150mm/1.38-6″, 6928640385056
$316.26
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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