These Titan Wheel Accessories 12mm hubcentric wheel spacers are designed with a 5x114.3 (5x4.5) bolt pattern and 66.1mm hub bore for Infiniti EX, FX, G35, G37, Q50, Nissan 300ZX, 350z, 370z, Altima and GT-R. 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.