Billet Aluminum Wheel Spacers The Pro-werks billet aluminum wheel spacers are precision CNC machined for proper fit and parallelism. CNC machining provides a much more accurate result over other production methods (die-stamped, laser or water jet). It takes a little more to make them correctly - but we know you will appreciate getting a great product for your hard earned dollar. There is so much riding on these components, it’s worth using the best parts available. You can always count on Pro-werks to do it right! Available in several bolt patterns, in either 1/4" or 1/2" thicknesses. Finished with silver anodizing for durability and corrosion resistance. If needed, reducing stud bushings are also available separately. Backed by The Chassis Shop's Satisfaction Guarantee.