Fixed calipers:

Progressive plain ring gauge P/NP..

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

Calibrated part: Roughness Ra0.08, 45° ground smooth countersink.