About this item Connector: NMO to PL259; Diameter: 55MM (2.15'); Suction: 12KG [5M RG58 Coaxial Cable] Flame retardant, high and low temperature resistant material, convenient and durable. Mini NMO Mount Base is suitable for UHF NMO antennas and lighter NMO antennas. Not recommended for heavier antennas that will be used in moving cars. Please select a larger base for heavier antennas. It works best on a flat metal surface. Will not work on aluminum, titanium, or plastic. Dimensions: 5.51 x 4.92 x 2.32 inches.