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29 mm Double Block — Swivel
Efficient bearings surface reduces winch effort and increases halyard life
Number Thread Size Style 33-611 1/2-20 RH Toggle Nut
or fiberglass hulls
The Eldridge Tide and Pilot Book
Harken Double Swivel Carbo Block - 57mm Bomar 29 mm Double Block —Low friction Carbo Air blocks are lightweight, strong, reliable and affordable. Companions to the popular Harken Black Magic block line, these small, compact blocks have very high working loads for safe, easy trimming.
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