These Titan Wheel Accessories 3/8 Inch wheel spacers are designed with a 5x4.5 (5x114.3) and 5x4.75 (5x120) bolt pattern for Cadillac XLR, Camaro, Corvette, S10 Blazer, GMC S15 Jimmy, Sonoma or Pontiac Firebird. They are machined from T6 6061 billet aluminum, making them both lightweight and durable. These spacers will improve the stance of your vehicle, providing a more aggressive look while also adding additional clearance for aftermarket brake and suspension parts. They also allow for larger wheel and tire combinations to be installed, giving you more options for customization.