The Harken 57mm Double Ratchamatic Block is a workhorse for controlling lines on sailboats, particularly those requiring power and control under tension. The combination of double sheaves, the innovative Ratchamatic mechanism for both winching and free running, and a relatively compact size make it a valuable addition to any control line system on medium and larger vessels
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Specifications
| Bearing type | Ball bearing |
| Recommended line - Max Ø (mm) | - |
| Sheave Ø (mm) | 57 |
| Ratchet | Yes |
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