I work in a truck accessories shop and they served the purpose I needed but I'm not a fan of them, I have them for temporary use until I get one can adjust the wheels with the correct reach to clear my upper control arm. They caused a lot of vibration, but that's almost common with spacers. I always thought if they snap or a bolt snaps I made sure to use red Loctite when installing them but I recently took them off and fitted a set of -12mm offset wheels to clear the upper arm. I do not recommend them for long-term use.