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As modern petrol engines get smaller in capacity, they also get physically smaller as well. Sizes: 14mm (O.D 18mm), 16mm (O.D 20.4mm), 18mm (O.D 23mm). Thin walled spark plug sockets are required for access in many modern engines.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.