These hub centric spacers-adapters move your wheels out to help fit wider tires and give your vehicle a wider track and improve stability. Constructed of double anodized black extra thick 6061T6 aluminum for long life and extra corrosion resistance. All hardware is grade-8 for extra strength. Each part number comes as a spacer pair. Included are 10 pre-installed grade-8 wheel studs, 10 lug nuts and thread locker.. This pair of 1.375 inch black aluminum wheel adapters from Rugged Ridge convert a 5x5 inch to a 5x4.5 inch bolt pattern.