| Parameter | Specification | 
| Material | Glass, ceramics, etc. | 
| Shape | Square | 
| Outer diameter size | 20——300mm | 
| Outer diameter tolerance | ±0.05mm | 
| Thickness size | 0.3mm——0.8mm | 
| TTV | <5μm | 
| Monolithic parallelism | ≤0.02 | 
| Appearance quality | 20/10 | 
| Roughness | Ra<1nm | 
| Angle | 90°±0.5° | 
| * Remarks: Can be customized according to customer needs | |

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