What size allen wrench for FPP head pipe adjustments?

[ItsRixter]

I can't seem to find the right size allen to use. Part of my problem is not knowing if it is standard or metric.
Can anyone provide the correct size allen wrench to use to adjust the three water screws in the head pipe?
thx

 

[vomitspot]

3/32 if i remember correctly

 

[Freakrider]

Don't forget to anti-seize them.

 

[ItsRixter]

Thank Guys. I wasn't sure if I had the wrong size or if it was the right size but partially stripped.

I put the head pipe in the BBQ @400 degrees for 80 minutes and screws came out like a brand new setup