hot runner coil Heater, is enclosed to inner and outer pipes , which ensure the body heated uniformly. 1,Coil heater are small section lineat heating elements.2,Voltage and power according to your requirement.3,It is useful for hot runner mould,plastic injectiong,plastic extruder machine etc.4,Thermocouple type k/j/e can be attached.5,1year quarantee time.