Machining method shaping (planing).
Ra: 32, 63, 125, 250, 500, 1000, 2000, 4000_in. Rz: 154, 268, 488, 1009, 1950, 3998, 7603, 14440_in. Quantity 8pcs.
For checking, identifying and specifying the roughness by symbol.
Rust-proof, made of pure Nickel.

Insize 4120-20, METRIC THREAD RING GAGE, GO, M20x2.5, 6928640341519
3M 54135, Scotch-Brite Roloc AL Surface Conditioning Disc TR, 2 in x NH A VFN, 7100075708, 200 per case
3M 05067, Cubitron II Stikit Film Disc 775L, 400+, 6 in x NH, Linered w/Tab, Die 600Z, 7100145474, 250 per case
3M 54137, Scotch-Brite, Roloc AL Surface Conditioning Disc TR, 2 in x NH A CRS, 7100075554, 200 per case
3M 64467 Scotch-Brite Durable Flex Belt, DF-BL, A/O Fine, 1/2 in x 18 in, 7100010673 