| Flat Width (mm) | Groove Width (mm) | Single Diameter Hole | % Open Front | % Open Back | |
| 13 | / | 3 | M | 11.8 | 30.7 |
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| Hole Diameter Front (mm) | Hole Diameter Rear (mm) | Hole Vertical Spacing (mm) | Hole Horizontal Spacing (mm) |
| 10 | 10 | 16 | 16 |
13/3M11.8
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2000, RPG Diffusor Systems, Inc. |