| Parameter | Specification | 
| Material | Glass, quartz, etc. | 
| Outer diameter size | 29.3×11mm | 
| Outer diameter tolerance | ±0.03mm | 
| Minimum thickness | 0.15mm | 
| TTV | <5μm | 
| Channel width | <60μm | 
| Appearance quality | 20/10 | 
| Roughness | Ra<1nm | 
| Depth tolerance | ±5μm | 
| * Remarks: Can be customized according to customer needs | |

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