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| Material | BK7 or UV fused silica |
| Diameter Tolerance | +0/-0.15mm |
| Thickness Tolerance | ±0.25mm |
| Clear Aperture | ＞Central 85% of diameter |
| Parallelism | ＜5″ |
| Surface Quality | 20/10 |
| Transmitted Wavefront | λ/10 @632.8nm |
| Chamfers | 12.7 & 25.4mm:0.25-0.75mm face width x 45°±15°
50.8mm:0.38-1.14 mm face width x 45°±15° |
