Complete the Billet 'Look' in your Mustangs engine compartment with UPR's new Billet Engraved Radiator Cap Cover showing off a machine finish that is setting the industry standard! CNC Machined from 6061 Billet Aluminum for a perfect fit including the Diamond cutter final pass giving it the best finish possible. UPR was the first company to introduce a complete line of billet and still the leader in top notch dress up items for your car.