When you level your Ford F250/F350 between 2"-2.5", caster is reduced by as much as 1°. The addition of these Kryptonite 2° shims are required to keep caster alignment within spec, and to ensure proper tracking and drivability with oversized tires. The Kryptonite shims are durable and coated in a bright gold zinc finish to guarantee a long life and corrosion resistance.