The tie rod sleeves are brush 6061-T6 aluminum drawn tubing for strength, durability, and precise fitting. The hexagonal rods are made for "on the spot" quick refine adjustment. These are great for correcting negative camber - when the top of the wheel is tipped in towards the body.Camber is the tilt of the wheel along its vertical axis. Running wider tires or car with lowering springs can cause this issue where your tires are wearing out on the inside. They are also great for older cars where the suspension tends to sag hence the wheel looks "spray out".
The adjustable caster toe kit can straighten the wheels by pushing out the lower portion of the wheel something you can't do with the stock lower control arm. With the combination of the adjustable camber arm and the lower caster arm, the wheel will be aligned the way it should be and that will help minimized the inner and outer tire wear.