| Material | Float Glass |
| Diameter Tolerance | +0.0, -0.20mm |
| Clear Aperture | >90% |
| Flatness | N4 @ 632.8 nm |
| Surface Quality | 60-40 scratch and dig |
| Bevel | <0.25mm× 45° |
| Reflectivity | R > 87% per face at 550 nm |
| Minor Diameter (mm) | T (mm) | Part No. |
| 25 mm | 5 | EPM-25D |
| 38 mm | 8 | EPM-38D |
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