The coil heater is known as CL50-045E; please compare it to SSTC-31. The coil heater inner diameter is 0.500", and the coil heater length is 4.625". The electric coil heater leads are 36" long with stainless steel overbraid. The electric heating coil also comes with a ground wire and a thermocouple. The coil heater is made for 120 volts and 300 watts. This Viper coil heater has a .13" by .13" square cross section. CL1 through CL5 Lead Orientations ? Click here to see the type CL4 lead orientation that this coil heater has.