DRZ oil filter nut size

What size is the nut on the oil filter. I've tried 9-12 mm also 9/32 to 7/16 I can't get my freakin head around it. Is it thin wall 10 because I have a quarter inch 10 but it doesn't seem to fit.
 
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I actually found an old mechanics tool that fit it. Can't read the size on it but hey it fits!
 

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