The Harken 57 mm Flip-Flop Block (Part 3122) is a low-profile, lightweight pulley block designed to keep lines close to the deck for clean, efficient trimming. Its hinged design pivots around the line axis, allowing variable lead angles and helping route halyards, mainsheets, or spinnaker sheets smoothly. Made with hard-anodized aluminum side plates and a strong 57 mm sheave, it offers a high working load (~1136 kg / 2500 lb) with a breaking load around 2273 kg (5000 lb), making it suitable for demanding sail-control needs on mid-size sailboats, racers, or cruisers. Ideal where a compact block is needed that keeps rigging tidy while handling heavy loads.
