Hexagon socket bolts, hexagon flange bolts, rivet bolts

High quliaty parallel blocks, accept custom sizes.
Chrome steel Gcr15, hardness is about HRC55
Work surface parallelism 0.005mm

Customized snap gauge, chrome steel GCR15 embedded in tungsten steel, produced with high precision of ±0.001mm

C type H type and other special snap gauge are customized
HRC58-62,Surface black treatment. The highest accuracy can reach 0.001mm