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![Harken Ball bearing hook-in block Harken Ball bearing hook-in block](https://optiteam.be/402-medium_default/harken-ball-bearing-hook-in-block.jpg/img/p/en-default-home_default.jpg)
Harken Ball bearing hook-in block - as used on Blackgold racing masts. Due to the curved saddle the block rests against the mast in a fixed position which prevents mast wear and creates a halyard system with less friction.
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Harken Ball bearing hook-in block - as used on Blackgold racing masts. Due to the curved saddle the block rests against the mast in a fixed position which prevents mast wear and creates a halyard system with less friction.