The size of the socket you need for a standard spark plug is typically 5/8 inch (16mm) or 13/16 inch (21mm). Most spark plugs have either of these two sizes for their hexagonal heads.

For a reliable spark plug socket, I recommend the "GearWrench 80546 5/8-Inch x 6-Inch Swivel Spark Plug Socket." It has a swivel design that allows for easier access and a rubber insert to securely hold the spark plug. Additionally, the "TEKTON 3/8-Inch Drive by 5/8-Inch Spark Plug Socket" is also a good option, known for its durable construction and affordable price.

When choosing a socket, ensure it's compatible with your ratchet or wrench, and consider a swivel design if you anticipate tight spaces. Always consult your vehicle's manual for specific spark plug size and socket recommendations.
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