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<p><strong>Harken 57mm Black Magic Block with Swivel</strong></p><p>This lightweight and highly efficient 57mm Black Magic Block is specifically designed for big boat performance races and cruisers. Renowned for their free-running capabilities, these blocks excel in demanding sail controls including mainsheets, runners, halyards, and spinnakers. The innovative center cage design keeps Torlon® roller bearings in perfect alignment, minimizing friction during high-load scenarios. These shackle blocks can be secured in two directions or swivel to prevent line twisting, enhancing user convenience. Low-load variants come with red isolators and utilize durable Torlon® rollers combined with robust 316 stainless steel shackles for longevity. Standard blocks incorporate 17-4 PH stainless head posts for added strength.</p><p><strong>Specifications:</strong></p><ul><li>Sheave: 57mm / 2-1/4in</li><li>Length: 119mm / 4-11/16in</li><li>Weight: 154g / 5.44oz</li><li>Shackle Pin: 6mm / 1/4in</li><li>Maximum Line: 12mm / 7/16in</li><li>Maximum Working Load: 7/16kg / 1655lbs</li><li>Breaking Load: 1500kg / 3300lb</li></ul>