Are our spark plugs 12mm or 14mm for gapping tool?

[Scott Curry]

So I want to buy a more professional spark plug gapping tool and they sell two sizes 12 mm and 14 mm and I can’t find anywhere the size of our spark plugs thread dia. Thanks in advance

 

[Stock_stinger]

14mm

 

[Scott Curry]

14mm

Awesome thank you very much!!

 

[monusa]

3.3(14mm), 2.0(12mm)