Whiteline Front Control Arm Lower Inner Front BoltsWhiteline caster shim kits are designed to improve cornering grip and vehicle straight line stability through increased static caster and dynamic negative camber gain. Features: Engineered to alter optimise caster alignment to maximize tyre contact patch during roll, improve turn in response & increase directional stability. Protective plating on all metal components acts as a hard skin that is much tougher than conventional paint allowing this