Spark plugs are a professional consumable for the maintenance of 4-stroke gasoline engines. This box of 50 units of NGK BM6A is perfect for workshops, distributors or technical services that perform frequent overhauls of machinery. With 14 mm threads and a thread length of 9.5 mm, they are compatible with small engines such as those found in motorcycles. Thanks to a nickel alloy electrode, an internal resistor and a copper core, reliable starting and efficient combustion are guaranteed even under demanding conditions.