Readylift 15-3485 1/2" Hub Centric Wheel Spacer for GM ReadyLIFT GM 1500 1/2" Billet Wheel Spacers For factory wheels only - These are NOT a wheel adapter for aftermarket wheels 6 lug on 5.5 wheel pattern. Estimated installation time: 0.3 hours +/- 0.5 hours Sold as a pair, includes two wheel spacers Made in the USA