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| Dimension B (profiled rail systems) | 7.6 mm | ||
| Dimension b | 7.6 mm | ||
| Dimension a | 18 mm | ||
| Outer diameter d | 21 mm | ||
| Nominal size | NMG 12x1 mm |
| Dimension d1 | 18 mm | ||
| Dimension d | 21 mm | ||
| Mass m (g) | 10 g | ||
| Tightening torque | 8 Nm |