What size is the Vios spark plug socket?

[DeAmelia]

Vios uses a 16mm long spark plug socket. The spark plug introduces high-voltage electricity into the combustion chamber, causing it to jump across the electrode gap to generate sparks that ignite the combustible mixture in the cylinder. The structure of a spark plug is as follows: 1. Steel shell: The lower part has fine threads for installation into the cylinder head spark plug hole, while the upper part features a hexagonal nut for attaching the spark plug socket to tighten or loosen the spark plug. 2. The metal rod serves as the center electrode. Its lower end contacts the upper end of the center electrode through conductive glass, and the upper end is equipped with a terminal nut. 3. High-alumina ceramic insulator between the steel shell and center electrode ensures electrical insulation. 4. The lowest part of the steel shell contains a curved side electrode. 5. The middle exterior of the steel shell has a copper gasket.