Plastic toggle switches are double insulated for moisture protection in all environments. toggle switch frame and toggle are black nylon, case is black phenolic plastic (flammability rating: UL 94 flame class 94V -1). Internal O ring for moisture and dust resistance. Terminals are brass, and all other parts are brass/bright nickel. Recommended mounting hole: 1/2" diameter. Recommended uses: Marine panels, automotive, recreation equipment, weather-resistant applications, industrial controls, trucks and buses. Available in SPST, SPDT, DPST, and DPDT configurations.