3M 33780, 641WY 1/4" X 24", 400 Mesh Diamond Cloth Belt, 7010534915 
Standard Abrasives 704972, A/O Tapered Cone Point, D-40 180, 7010368594, 100 per case 
Insize 1121-5002, DIGITAL INSIDE POINT CALIPER, 80-500mm/3.15-20″, 6928640385018
$843.95
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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