Harken 57 mm Carbo blocks

Carbo AirBlocks® are 60% stronger and 30% lighter than our Classic blocks. The nylon resin cheeks are reinforced with densely layered long fiberglass to create a compact block with a high load-to-mass ratio. The ball bearings, sheave, and cheeks are blackened for maximum UV protection. The blocks are equipped with either Cam-Lock or U-Lock mechanisms to secure the shackle in a frontal or lateral position or allow it to rotate freely. The high-load 57mm Carbo has a wide range of applications, suitable for mainsheets and jib sheets on dinghies and keelboats such as Lightning, Dragons, Solings, J/24s, and for mainsheet systems on catamarans. Uses include mainsail/jib sheets, fine trimming, mainsheet, control lines, downhauls, Cunningham, and leech tensioners.