3M 12952, Scotch-Brite Roloc Surface Conditioning Disc, SC-DR, A/O Very Fine, TR, 4 in, 7100007032, 100 per case 
Insize ISR-CSE325, SURFACE ROUGHNESS SPECIMEN, 8pcs per set, 6928640376658
$276.41
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.
