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The toggle heads of the halyard blocks are designed to fit on the studs commonly found at mast bases - check the diameter of the stud against the width of the block jaws and pin diameter
At Schaefer Marine
Precision Control
free-running blocks are compact
HARKEN 57 mm Aluminum Black Magic Double Block - Swivel, Becket, 3218 Shackle Style_Captive Halyard The toggle heads of theBlack 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. Used on offshore boats, these strong, lightweight blocks feature aluminum cheeks, and free rolling, high load Torlon roller bearings for a high strength to weight ratio. Use them for sail controls that see lots
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