Fork Terminal, Nylon Insulated, 18 - 14 American Wire Gauge (AWG), 1/4 Inch Stud Size. Fork design provides for fast and easy installation, without the need to remove fastener. Metal insulation grip sleeve crimps to wire insulation. providing protection to the crimp joint during high vibration applications. Internal barrel serrations assure good wire contact and maximum tensile strength. UL Flammability UL 94V-2/HB, maximum insulation temperature 221 degrees Fahrenheit (105 degrees Celsius). UL and CSA rated up to 600 Volts per UL 486A/B.