Thanks for your replies everyone. Sorry, I did mean 5/16-18.
After a few trips to home depot I figured out the correct size. It is indeed metric !
For anyone that comes across this problem in the future the hex bolt is 8mm diameter with 1.25 thread size (M8-1.25)
Theo: I like the Revels quite a bit but don't have a lot of experience with different speakers or the previous Revel Performa series. I bought them based on reviews alone and have not been disappointed.
After a few trips to home depot I figured out the correct size. It is indeed metric !
For anyone that comes across this problem in the future the hex bolt is 8mm diameter with 1.25 thread size (M8-1.25)
Theo: I like the Revels quite a bit but don't have a lot of experience with different speakers or the previous Revel Performa series. I bought them based on reviews alone and have not been disappointed.