Custom Fit 8 Lug Wheel Spacers: The spacers for car---Compatible with Chevrolet and GMC Models: 2011-2018 Silverado 2500 HD| 2015-2015 Silverado 3500| 2011-2014 Silverado 3500 HD| 2011-2018 Sierra 2500 HD| 2011-2015 Sierra 3500 HD| and more; For full models refer to the amazon garage tool or our picture Lug Centric Wheel Spacers: As with any wheel purchase, you must first decide what style, what wheel diameter, what wheel width, and what wheel spacers you need. If you are installing a lift kit and larger calipers, you just need to fit tire spacers to provide some extra width for stability About the Tire Spacers: 8x180mm vehicle PCD (bolt pattern) and 146mm hub bore must match| 1.5 inch thickness, this is also the size at which the wheels will be pushed out| M14x1.5 Studs Lug Nuts| Recommended torque: 85-90 FT/LBS| 12.9 grade studs, highest grade of bolt strength Safety Tips for Installers: The fear with any spacer is that it will come loose. To prevent this, be sure to not only follow the recommended torque specifications, check regularly for looseness and tighten to the recommended torque, but use high-strength thread locker we are equipped with on the stock studs that the spacer bolts to What You Will Get: 4pcs 8x180mm wheel adapters spacers, 2pcs high strength thread-locking, 1pc installation instructions and professional customer service support, do not hesitate to contact us if you have any doubts or queries; Once installed, gives the truck the clearance and tougher look you want, and handles much better