57 mm Black Magic® AirBlocks® are used on offshore boats where weight
and performance are critical. They feature free-rolling, large-diameter aluminum
sheaves with Torlon® roller bearings housed in a unique center cage. UV-resistant,
carbon-black Delrin® balls carry sideloads. Corrosion is minimized by isolating
Blocks are Hardkote-anodized and have 17-4 PH stainless headposts and shackles. Easily disassembled. Use it for sheets, halyards, running backstays and control lines.
Part Number: 3227