Galvanized 1-1/4 inch (3.25 cm) O.D., 35 inch (89 cm) long steel post with one end crimped for insertion into another post of the same O.D. Made of 18 gauge 1008-10 steel tubing, galvanized using the Flo-Coat (zinc-chromate-polymer) process for excellent corrosion protection. When used with the TP1 Mast assembly, this extension will raise the WeatherHawk wind sensors to a maximum height of 89 inches (231.4 cm), with an effective adjustment range of 72 to 89 inches (187.2 to 231.4 cm).