Harken has simplified the single line mainsail reefing kit developed from Garry Hoyt's patented concept making this kit lighter and easier to install. A must for single handers or shorthanded sailing. Reefing with the kit is simple: ease the halyard to a predetermined mark, tension the reefing line, and re-trim the sail. For boats to 27'. Everything you need for installation is included except the line, a cleat and stopper.