Spark plug socket size

[RKM]

As I research plugs for my 2005 3.0I some sites are telling me that they are 16mm and some say 14mm. Driving me nuts! Thanks

 

[patriot66]

16mm(5/8"). I have a Laser 250mm magnetic long socket. Does the job brilliantly

 

[RKM]

Thanks, I wonder why the other shows up on some searches?