Fixed calipers:

Flat Bore 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: aluminum with deep etching

Calibrated part: Roughness Ra0.08, bevelled countersink.