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| Customization: | Available |
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| After-sales Service: | Available |
| Warranty: | Available |
| Shipping Cost: | Contact the supplier about freight and estimated delivery time. |
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Suppliers with verified business licenses
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| material | BK7 or other material |
| length tolerance | +/-0.01 |
| width tolerance | +/-0.01 |
| center thickness tolerance | 0.005mm |
| surface quality | 80-50 to 10-5 |
| suface flatnedd | <lambda to lambda/20 |
| parallelism | <=1min--2sec |
| clear aperture | 80%--100% |

