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Harken Single Line Reefing and Lazy Jacks
Harken Single Line Reefing Kits let you shorten the mainsail in three easy steps: ease the halyard to a predetermined mark, tension the reef line, and trim the sail. Sails with reef points do not need modifying.
Harken Lazy Jacks Kits contain mainsails while reefing and dousing. They work extremely well with full-batten mains, but can also be used with conventional sails.