The Laird G8XTI vehicular mobile radio mount is a magnetic NMO mount with a TNC connector. Comes with corrosion-resistant materials used throughout for high durability and weather resistance, neoprene seal for moisture protection, high 80 lb pull strength that allows the antenna to stay put, a triple reinforced coaxial strain relief that eliminates cable pull out, and has a 3 1/4 in diameter.