3173 and 3174 high-load controls allow 2:1 to 6:1 purchases on offshore boats with mainsails over 37 m² (400 ft²). Controls feature 57 mm Black Magic Big Boat ball/roller sheaves and high-load aluminum sideplates.
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Spécifications
| Width (mm) | 57 |
| Length (mm) | 164 |
| Cordage recommandé – Ø Max (mm) | 12 |
| Ø réas (mm) | 57 |
| Hauteur (mm) | 28 |
| Charge de travail (kg) | 1134 |
| Charge de rupture (kg) | 2268 |
| Poids (g) | 981, 981 |
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