Spark plug sleeve, also known as spark plug wrench, is a special tool for removing the spark plug, for the hexagon cylinder design, the tube body has a handle through the hole. Generally, there are two specifications of spark plug sleeve, one of which is applicable to: 14. 8mm screw spark plug sleeve, 10mm screw spark plug sleeve. In addition, there is a kind of spark plug sleeve, the connection between the afterburner body and the sleeve takes the form of a universal joint, which is not limited by the position of the spark plug when used, which is more convenient. It is a special tool for manual removal and assembly of spark plugs. According to the assembly position of the spark plug and the hexagon size of the spark plug, different heights and radial sizes of spark plug sleeves are selected. When removing and installing the spark plug, install the spark plug sleeve and rotate it to avoid slipping the sleeve. When turning the spark plug sleeve, do not pull the handle out at will to avoid damaging the sleeve.