| Rounded Width (mm) | Groove Width (mm) | Single Diameter Hole | % Open Front | % Open Back | |
| 12R | / | 4 | M | 12.5 | 19.7 |
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| Hole Diameter Front (mm) | Hole Diameter Rear (mm) | Hole Vertical Spacing (mm) | Hole Horizontal Spacing (mm) |
| 8 | 8 | 16 | 16 |
12R/4M12.5
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2000, RPG Diffusor Systems, Inc. |