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.
- Maximum line Ø (mm) - 12 mm
- Maximum line Ø (in) - 7/16 in
- Maximum working load (kg) - 1134 kg
- Maximum working load (lb) - 2500 lb
- Purchase - 1:1 / 2:1