Fixed calipers:

Plain ring gauge.

Made with non-deformable steel, with high wear resistance.

Material: 1.2842

Heat treatment: Hardening + tempering + CRYOGEN hardness: HRC.63+1

Surface treatment: BURNISHING

Grip: knurled surface

Etching: deep, lubber line, quota actually obtained approximation 0.5 μ

Calibrated part: manufacturing tolerance +2μ, roughness Ra0.08, 45° ground smooth countersink.