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