Granite Square Ruler
1. Material: Jinan Black
2. Features: High-Precision, no rust, acid and alkali-resistant, no magnetized, no deform, good abrasion resistance etc.
3. Applicable area: The granite square ruler is mainly used to test the verticality and parallelism of the parts in industrial production and laboratory etc. The implementation standard of surface precision and verticality is GB6092-85.
4.We can produce with your special request.