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Sheave Ø (mm) 75 mm Sheave Ø (in) 2 15/16 in Length (mm) 151 mm Length (in) 5 15/16 in Weight (g) 442 g Weight (oz) 15
reliable—and affordable
please contact the factory before installation
length is 35" (89cm) pin to pin and the max
Harken 57mm Aluminum Block Swivel w/Becket Flying Scot Sheave Ø (mm) 75 mmHarken 57mm Aluminum Block Swivel w Becket Black 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
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