The Through-Bolt Hub is designed is for adapting a plumbizer to a mast arm or signal pole by bolting through a pole where there is not a welded 1 ½” threaded hub to accept the 45B. It is attached by drilling through a pole and using a threaded rod with an acorn nut on the opposite side. Also two 11D castings can be installed back to back on the same pole using the same threaded rod.

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• Allows back-to-back signal mounting on a pole​

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• Mount a signal anywhere on a pole

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• May be ordered to go through various pole diameters

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• Buy America, Build America (BABA) Compliant