These hub centric adapters convert 5 on 5 to 5 on 4.5, allowing you to put TJ and YJ wheels on the JK. They also space your wheels out an extra 1.375 inch thick to help fit wider tires and give your vehicle a wider track and improved stability. Constructed of double anodized black extra thick 6061T6 aluminum for long life and extra corrosion resistance. Wheel studs are grade-8 for extra strength. Included are 10 pre-installed wheel studs and 10 lug nuts. Sold in pairs.