what is this?

Okay thanks, yea I think I'll just get a new one.

And on another note I was replacing the wheel studs in the rear and found that the studs that I have are the wrong size, well the knurl at least. What is the knurl size for the rear? It seems like the studs that came out had a 0.668 or so, but ARP has the rear knurl 0.680, and that seems too big.