With the Birdsall Marine Rod Holder Cup Mount you can turn any gunnel rod holder into a temporary drink holder by simply dropping in the drink holder. The base is designed to work with any 15 or 30 degree rod holders. To adjust from either 15 or 30 degree simply unscrew the shaft and re-screw the shaft. One end is cut at 15 degrees and the other is cut at 30 degrees.
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