These are top quality Messerschmitt joints (or ""Heim"" after the one licensed to copy the Messerschmitt product). I use these spherical rod ends for the drag link, tie-rod, and panhard rod on the steering and suspension of my 4x4. The spherical rod ends on the steering rods last a long time. The panhard rod puts a lot more force on the rod end, but these FK units still last longer than rubber bushings. After about 15K miles, the rod ends have a little play. Perhaps a larger one would last longer, but these fit the frame and axle attachments perfectly.