These arms are good for adjusting caster, for anything from stock through some aggressive lift range. The adjusting threads are really beefy, well-cut, well-finished, and very smooth. The bushings are solid bonded rubber, more shock-absorbing than polyurethane (which I like), and non-greasing.WARNING: I got these installed wrong the first try, and they hit my tires at full lock. Follow the instructions (duh). But also, note that the adjustment is . You can't make a half-turn, because the threaded stud is attached at an angle. Teraflex likely made them this way to save $$ because a straight-in thread would require another mandrel bend. But no biggie, just make sure you have it turned to the correct angular position.The thread is 12 per inch, or 0.080"" pitch. At this ratio, one full turn results in approximately 0.5 degrees of caster change. Useful to know.Lastly - I've dealt with Teraflex tech support many times, for various reasons - both before and after purchase. Always available, qualified, patient, and helpful. It gets no better.