Which tool is commonly used to remove and install spark plugs?

A spark plug socket is specifically designed to accommodate the unique shape and size of spark plugs, making it the most effective tool for both removal and installation. This type of socket typically features a rubber insert or a magnet that holds the spark plug securely, preventing it from falling out as you work. Additionally, the deep design of a spark plug socket allows it to reach down into the engine’s cylinder head, where the spark plugs are located.

Using other tools, such as a ratchet wrench, may not provide the precise fit or necessary depth required to effectively engage with the spark plug. While a ratchet wrench can be used with various sockets, it does not specifically cater to spark plugs and can risk damaging them if appropriate torque isn’t applied. A torque wrench, while crucial for ensuring that spark plugs are tightened to the manufacturer's specifications, cannot be used alone to remove or install spark plugs without the proper socket. A screwdriver is not applicable at all, as it lacks the necessary design for engaging the spark plugs’ hex shape.

In contrast, the spark plug socket’s tailored design is what makes it the standard tool in any mechanic’s toolbox for handling spark plugs efficiently and safely.