What are "knock outs" in reference to alignments?

knockouts are metal or plastic tabs that the factory puts in trucks so that it holds the alignment that was set at the factory. when you get your first alignment done at a shop they usually have to remove these tabs hence why they are called knock outs. because they have to knock them out to adjust the camber and caster.

a little high in price but it is hat it is. are you happy with the way the car drives