Designed for the top of a 4x4 rack (actual dimensions 3-1/2 x 3-1/2 inches) and fits perfectly. However, my posts (except for one) were 3-1/2" in diameter with flattened sides. The fit was, but a bit loose, so I attached it with a white screw through a hole drilled from the inside up One star off for plastic. Be thinner than expected.
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