3M 45100, Roloc Disc Pad TR, Hard 1-1/2 in 1/4-20 Internal, 7000045286 
Insize 3227-E05, THREE POINTS INTERNAL MICROMETER, .425-.5″, 6928640328909
$343.13
Graduation .0001″
Rachet stop.
Optional accessory: setting rings (part no. 6313), micrometer stand and clamp (part no. 6301 and 6301-2).
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