Reefing Hook

A curved metal fitting on a boom or mast used to secure the reefing cringle of a sail when reducing its area in strong winds.

A reefing hook is an essential piece of hardware found on many sailing vessels, particularly those with traditional slab reefing systems. Typically made of stainless steel or another corrosion-resistant material, the reefing hook is mounted near the gooseneck of the boom or on the mast itself. Its primary function is to secure the reefing cringle—a reinforced eyelet located along the luff of the sail—when the sail is being reefed. Reefing is the process of reducing the sail area to maintain better control of the vessel and prevent excessive heeling or damage to the rigging in high winds. 

To use a reefing hook, the sailor first lowers the sail to the appropriate reefing point, aligning the reefing cringle with the hook. The cringle is then slipped over the hook, holding the sail in place while the reefing lines are tightened to secure the foot and leech of the sail. This ensures the sail remains stable and properly shaped, even in challenging conditions. Reefing hooks are valued for their simplicity and reliability, as they provide a quick and secure method for reefing without the need for complex mechanisms. Proper maintenance, such as regular inspection for corrosion or wear, ensures the hook remains functional and safe for use.