Through-hole resister, is a common name for plug-in resister. Through hole resisters, the outer layer is a layer of metal film or carbon film, color ring resistance in the middle of the hole, this through hole resistance is the plug-in resistance. A plug - in resistor is a current limiting element. After the resistor is connected to the circuit, the resistance value of the resistor is fixed. Two pins can limit the current through a certain size.
