Insize ISR-CSE336, SURFACE ROUGHNESS SPECIMEN, 5pcs per set, 6928640376733

Machining method polishing.
Ra: .5, 1, 2, 4, 8_in. Rz: 12, 14, 27, 29, 61_in.
For checking, identifying and specifying the roughness by symbol.
Rust-proof, made of pure Nickel.