Heavy duty control rods with ball link ends (2pcs/bag)
Very tough rods!
M4 thread for the rod itself, if the length is not OK you can always make a new rod out of M4 threaded rod and cut to length.
The ball hole is M3 (3 mm) size.
I've used these for upper&lower links on crawler type cars and they hold on very nicely, the rod material is really hard and no play in the balls either.
Cannot beat these for this price!