Focus Fanatics - camber arms and toe arms

I just installed the camber and toe arms on mine this weekend. I like the quality.
I forgot to measure when I had it up on the jacks but what size is the jam nut? I used a adjustable wrench to tighten them but an open end wrench would allow more easy access but I didn't have one that big.

Oh I thought I'd mention that yo may want to offer a reminder to those folks that install the camber arms that they need to know if a set of M12x1.75 nuts may be needed also. I had to get a couple since my trailing arms had been modified to allow for a camber bolt kit. The factory nut is cut off the trailing arm bracket to put the camber bolt kit on.