![Harken 57mm Aluminum Low Load Black Magic Block w/Swivel [3226] Marine Navigation & Instruments | Instruments *The RAM-B-174-UN4U can mount to](https://cdn.shopify.com/s/files/1/0499/1942/6726/files/93959XL.jpg?v=1691954749)
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*The RAM-B-174-UN4U can mount to both the brake/clutch reservoir or any round rail that is 0
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Standard applications of the shackle
23" (6 mm)
Harken 57mm Aluminum Low Load Black Magic Block w/Swivel [3226] Marine Navigation & Instruments | Instruments *The RAM-B-174-UN4U can mount to57mm Aluminum Low Load Black Magic Block with Swivel 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 the line from
