Insize ISR-CSE331, SURFACE ROUGHNESS SPECIMEN, 8pcs per set, 6928640376696

Machining method spark erosion (EDM).
Ra: 16, 32, 63, 125, 250, 500, 1000, 2000_in. Rz: 100, 180, 288, 568, 988, 2048, 4200, 7840_in.
For checking, identifying and specifying the roughness by symbol.
Rust-proof, made of pure Nickel.