Harken Aluminum Block with Swivel - 57 mm (2 1/4") - 3215

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.

Specifications:

• Sheave Diameter: 57 mm (2 1/4")
• Length: 119 mm (4 11/16")
• Weight: 152 g (5.36 oz)
• Shackle Pin Diameter: 6 mm (1/4")
• Maximum Line Diameter: 12 mm (7/16")
• Maximum Working Load: 1134 kg (2500 lbs)
• Breaking Load: 2268 kg (5000 lbs)