3M 51033, Roloc Disc 361F, 36 YF-weight, TSM, 3 in, Die RS300VM, 7000148150 
Insize 7382-16, 3-WIRES, .0132″/0.335mm, 6928640361753
$326.56
Used with standard outside micrometers with spindle .25″DIA to measure pitch diameter of screw threads.
Diameter accuracy: ?20_in. Cylindricity: 39_in.
Hardness: HRC60.
Supplied with manufacturer inspection certificate.
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