Product Description Harken 75mm Aluminum Double Block — SwivelBlack Magic Air blocks are a top favorite of Big Boat performance racers and cruisers. These lightweight, free-running, powerful performers are used for sail controls that see lots of action: mainsheet, runner, halyard, and spinnaker systems. A center cage keeps Torlon roller bearings separated and parallel to reduce friction. Shackle blocks lock in two directions or swivel to keep line from twisting. Torlon is a registered trademark of Solvay Advanced Polymers L.L.C. Specifications Length (mm) 134 mm Length (in) 5 1/4 in Weight (g) 721 g Weight (oz) 25.44 oz Maximum working load (kg) 3402 kg Maximum working load (lb) 7500 lb Breaking load (kg) 6804 kg Breaking load (lb) 15000 lb Sheave Ø (mm) 75 mm Sheave Ø (in) 2 15/16 in Shackle pin Ø (mm) 10 mm Shackle pin Ø (in) 3/8 in Maximum line Ø (mm) 14 mm Maximum line Ø (in) 9/16 in
