3M 54109, Scotch-Brite Roloc AL Surface Conditioning Disc TR, 1-1/2 in x NH A MED, 7100075533, 200 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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Mounted Points
3M 64797, Scotch-Brite EXL Unitized Mounted Point, A21 x 1/4 in 8S FIN, 3M 7010292685
$19.03
