The product is a Genuine General Motors OE Bolt, specifically designed for use with Spark Plug Wires. This bolt, with the part number 3909821, is a direct replacement and is sold individually. As a genuine OEM part, it is manufactured by General Motors and is guaranteed to fit and function properly, ensuring optimal performance and durability for your vehicle's exhaust and emission systems. This high-quality bolt is a reliable choice for maintaining your car's manifold and headers.