Used with standard outside micrometers with spindle .256″DIA to measure pitch diameter of screw threads.
Diameter accuracy: ?20_in. Cylindricity: 39_in.
Cylindricity: 1um. Hardness: HRC60.
Supplied with manufacturer inspection certificate.
Supplied with manufacturer inspection certificate.

3M 06959, Floor Surfacing Discs, 5 in x .25 in, 6 Slots .5 in length, 20 Grit, 7010353435
Dynabrade 95843 Dynabrade Air Lube 10W/NR, 1 Gallon 