Material: granite
Standard: JJG194-92
Specification: 100x100-800x800mm or customize
Hardness of the working surface: HS70
Surface treatment: ground finish
Precision grade: 00-0
Packaging: plywood box
Technical specification of granite square box:
| Specification(mm) | Parallelism | Flatness | Verticality | |||
| Precision grade（um） | ||||||
| 00 | 0 | 00 | 0 | 00 | 0 | |
| 100×100×100 | 1 | 2 | 1 | 2 | 1 | 2 |
| 150×150×150 | 1.5 | 3 | 1 | 2 | 1.5 | 3 |
| 200×200×200 | 2 | 4 | 1.5 | 3 | 2 | 4 |
| 300×300×300 | 3 | 6 | 1.5 | 3 | 3 | 6 |
| 400×400×400 | 4 | 8 | 2 | 4 | 4 | 8 |
| 500×500×500 | 5 | 10 | 2.5 | 5 | 5 | 10 |
| 600×600×600 | 6 | 12 | 3 | 6 | 6 | 12 |
| 800×800×800 | 8 | 16 | 4 | 8 | 8 | 16 |
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