Centerline Wheel Thickness

64physhy said
Lug Nut Shank Length (in) 0.746-0.800 in.
Lug Nut Shank Diameter (in) 0.679-0.687 in.

3/4" long by 11/16 diameter

For 8.5's this is about spot on.

I just measured the ones I got from my E-bay guy.

Shank:
Diameter .678
Length .795