| BEVELED EDGE LOCATION AND QUANTITY | 2 LONG AND 2 SHORT EDGES ON FRONTSURFACE; 2 LONG AND 2 SHORT EDGES ON BACK SURFACE |
| FSC APPLICATION DATA | PERISCOPE,TANK |
| LENGTH | 6.490 INCHES MINIMUM AND 6.500 INCHES MAXIMUM |
| MATERIAL DOCUMENT AND CLASSIFICATION | MIL-G-174, GRADE D, TYPE 523-586 MIL SPEC SINGLE MATERIAL RESPONSE LOCATION NOT OTHERWISE SPECIFIED |
| MATERIAL | GLASS OPTICAL LOCATION NOT OTHERWISE SPECIFIED |
| SPECIAL FEATURES | FRONT SURFACE REFLECTIVE. MIRROR BONDED TO A HOLDER. |
| WIDTH | 2.330 INCHES MINIMUM AND 2.340 INCHES MAXIMUM |
| THICKNESS | 0.302 INCHES MINIMUM AND 0.332 INCHES MAXIMUM |
| BEVEL DEPTH | 0.014 INCHES NOMINAL AND 0.217 INCHES NOMINAL |
| BEVEL ANGLE IN DEG | 42.000 MINIMUM AND 48.000 MAXIMUM |