CX-5 NGK spark plugs 14mm or 9/16 and torque?

[CX5BC]

Hi,
Can some one please confirm the NGK spark plugs use 14mm or 9/16 socket. Does it matter which one? Also I don't have torque wrench, on YouTube looks like hand tight and another quarter turn, is this about right? Thanks.

 

[ColtX-5]

Hi,
Can some one please confirm the NGK spark plugs use 14mm or 9/16 socket. Does it matter which one? Also I don't have torque wrench, on YouTube looks like hand tight and another quarter turn, is this about right? Thanks.

You know there is only 0.011 inches difference between 14mm and 9/16", right?