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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Specifications
| Width (mm) | 57 |
| Length (mm) | 164 |
| Recommended line - Max Ø (mm) | 12 |
| Sheave Ø (mm) | 57 |
| Height (mm) | 28 |
| SWL (kg) | 1134 |
| NBL (kg) | 2268 |
| Weight (g) | 981, 981 |
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