What size deep metric socket do I use to remove the original spark plugs? on 2005 Mercedes-Benz C240 4MATIC

I'm changing spark plugs on my 2005 Mercedes C240 4matic for the first time and need to know what size deep metric socket to use to remove the original plugs? Thanks!

Asked by for the 2005 Mercedes-Benz C240 4MATIC
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