| Flat Width (mm) | Groove Width (mm) | Single Diameter Hole | % Open Front | % Open Back | |
| 28 | / | 4 | M | 7.5 | 14.2 |
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| Hole Diameter Front (mm) | Hole Diameter Rear (mm) | Hole Vertical Spacing (mm) | Hole Horizontal Spacing (mm) |
| 9.6 | 9.6 | 16 | 32 |
28/4M7.5
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2000, RPG Diffusor Systems, Inc. |