most spark plugs have 14mm threads but 12mm diameter threads are harder to find.
I love NGK spark plugs, but I have to admit I was surprised it had a 18mm hex my old one was 5/8" and I have had 13/16 hex on the larger spark Plugs. I have used a lot of 3/4" sockets on lawn mower spark plugs which is also 19mm. I have 18mm sockets and the plug tightened nicely it was for a motorcycle and is working very well in my push mower. The price is so good that I don't know how he was able to pay for shipping (included free) and I used the top off an old plug, so it worked out well for me. shipping was quick and packaged well. I am very happy with this purchase on a hard to find 12mm threaded plug with a long reach of 19mm.
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