1. This product adopts the principle of 1/4 short-circuit wavelength to achieve a good lightning protection effect. The arrester has strong structure, beautiful appearance and easy installation.2. Interface: UHF SL16 PL259 SO2393. Frequency: DC-3GHz4. Length: 41mm x 78mm5. Application: Lightning arrester6. Material: all copper nickel plated7. Conductor: all copper plated with real gold8. Insulator: PTFE9. Impedance: 50ohm

http://olla.gr/ca-35rs-pl259-so239-walkie-talkie-radio-repeater-coaxial-lightning-antenna-surge-protector/