The most common spark plug socket size is 5/8 inches, which is also equal to 16mm. However, the actual size you need will vary depending on your vehicle. You can find the spark plug socket size for your car in the owner's manual or by searching online.

Here are some recommended spark plug sockets:

* **Gearwrench 88888 Spark Plug Socket Set:** This set includes 10 sockets in sizes ranging from 5/8 inches to 13/16 inches, as well as an extension and a ratchet. It is a good option for most vehicles.
* **Sunex 63650 Deep Reach Spark Plug Socket:** This socket is designed for deep-seated spark plugs. It is made of high-quality steel and has a rubber insert to protect the spark plug.
* **Pro-Grade 88400 Spark Plug Socket:** This socket is made of impact-resistant steel and has a 12-point design for better grip. It is a good option for professional mechanics.

When choosing a spark plug socket, it is important to make sure that it is the correct size for your vehicle and that it is made of high-quality materials. You should also consider the features that are important to you, such as a deep reach or a 12-point design.

I hope this helps!
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