Windsurfing: The fin or skeg allows the board's tail to grip the water and keep it travelling straight. Fins are interchangeable, with many variations in size and shape for different disciplines and conditions. Most boards have a single fin, but some wave boards (known as 'Twinzers') have two fins, while a 'tri-fin' has a main central single fin with a smaller 'thruster' fin on each side, for extra grip on the wave.
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Fin Bolt
