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Not right off hand but they should be in the electrical section of places like home Depot or Lowes. I had my service entrance upgraded a couple years ago and the electrician had to replace the mast with a longer one because of the upgrade  from 100 amp to 200 amp service which needed more height clearance. Both the old and new masts were galvanized and quite heavy walled to withstand the strain of the drop lines from the pole to the house.