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Atruck is a wooden ball, disk, or bun-shaped cap at the top of amast, with holes in it through which flaghalyards are passed.[1] Trucks are also used on woodenflagpoles, to prevent them from splitting.[citation needed]
Without a masthead truck, water could easily seep into the circular growth rings of a wooden mast. However, the grain in the truck is perpendicular to that of the mast, allowing the water to run off it.[citation needed]
Flagpoles often have a truck on top of them which often holds a decorative piece above, known as a finial, which is usually a ball. They are usually made of solid metal, however a tradition in theUnited States is to sometimes put a razor, a penny, or a grain of rice inside.[2]
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