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
dissimilar metals.
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
**Replaces
1965
|
)
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best you can find. If within 30 days you find a better price,
we’ll refund the difference as a store credit. 
