The ACDelco GM Original Equipment 41-993 Iridium Spark Plug in a 4 pack is a high-quality ignition component designed specifically for GM vehicles. With the trusted ACDelco brand name, you can be confident in the superior performance and durability of these spark plugs. These iridium spark plugs are engineered to provide reliable and consistent spark for your engine, ensuring optimal combustion and improved overall engine efficiency. Perfect for car and truck owners looking to maintain their vehicle's ignition system with genuine GM parts. see photos. m16