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This Series 55 Ratchet Orbit single block is the only one in its class that gives you auto and manual engagement modes. It provides up to 21:1 holding power and enables you to release sheets smoothly. That's nearly double the holding power of its nearest competitor.
The sheave has twelve, rather than eight, gripping faces, which distribute the load and minimize rope wear. Use it for mainsheet and spinnaker sheet systems on dinghies, sportboats, and small keelboats; halyard, vang, and backstay applications on boats up to 26' (8m); and control line applications on larger yachts.
Make sure you have a standard Dee shackle with a slotted pin of 5/32 in diameter for attachment.
