3M 45179, Roloc Disc Pad TR, Medium 4 in 1/4-20 Internal, 7000045281 
3M 28476, Disc pad Hub, 2-1/2 in 5/8-11 Internal Low Profile, 7000045288 
Insize 2394-45A, ZERO SETTER, height 4″, 6928640359552
$456.25
Magnetic base with on-off switch.
Height: 4″
Accuracy: ? .0004″
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