Insize ISR-CSE335, SURFACE ROUGHNESS SPECIMEN, 6pcs per set, 6928640376726

Machining method honing.
Ra: 2, 4, 8, 16, 32, 63_in. Rz: 12, 22, 40, 80, 168, 360_in.
For checking, identifying and specifying the roughness by symbol.
Rust-proof, made of pure Nickel.