Insize ISR-CSE333, SURFACE ROUGHNESS SPECIMEN, 5pcs per set, 6928640376702

Machining method hand filing.
Ra: 16, 32, 63, 125, 250_in. Rz: 120, 224, 496, 900, 2440_in. Quantity 5pcs.
For checking, identifying and specifying the roughness by symbol.
Rust-proof, made of pure Nickel.