I've got 1/4", 3/8", and 1/2" sets of both SAE and Metric, both reg and deep, in all drive sizes, e-torx, spline drive, crows feet, you name it. Somehow I missed that this nut was 18mm, and my metric wrench set goes from 8mm to 19mm, but there is NO 18mm in the set...Grrr....I guess I never missed it, never had a need for it. I have 18mm sockets and guess I never had a spot where a socket wouldn't go. Everything I've taken apart so far is mostly 10, 13, 15, and 19mm. I am eying a pair of those Sears cable-operated hose clamp pliers, those are SWEET!

BTW, the ball joint nut is MUCH easier to get to with the caliper and rotor off, just as a point of reference