12 feet x 2-1/2 inches outside diameter mast. MM12 12FT MAST
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Brochure
https://static.graybarcanada.com/Generic/id-bro-v1-service-masts.pdf
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Spec Sheet
https://static.graybarcanada.com/Products/Service%20Entrance/Service%20Ent%2C%20Mast%20%26%20Acc%27Y/MICMM12/Files/MICMM12_Files.pdf