HARKEN Premium Sailing 57mm HL Black Magic Air Boat Block, 57mm, Part 3215
Special Features
- Black Magic Air blocks are a top favorite of Big Boat performance racers and cruisers
- Lightweight, free-running, powerful performers are used for sail controls that see lots of action: mainsheet, runner, halyard, and spinnaker systems
- 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
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