The Champion Copper Plus 841-1 Small Engine Spark Plug allows you to get more life from your equipment. It s sized and threaded for small engines such as those in lawn mowers or farm equipment. This copper core spark plug is highly conductive to create consistent arcs for igniting the fuel. It s built to both SAE and ISO standards to give you reliable performance in all sorts of machines. It s simple to remove and replace whenever you need. Make sure to check your equipment s part list to ensure that this product is compatible.