Spidertrax 1-3/4 thick, 5 on 5' bolt circle, 6061T6 aluminum spacers are an easy way of spacing out front and rear 2007-2018 Jeep Wrangler JK, 2006-2010 Commander XK, 2005-2010 Jeep Grand Cherokee WK, & 1999-2004 Grand Cherokee WJ axles The WHS021 Wheel Spacer Kit is designed specifically for the following Jeep vehicles: 2005-2010 Grand Cherokee WK, 2006-2010 Commander XK, 2007 Wrangler JK. Factory machined pre-installed 4140 wheel studs. Anodized 6061T6 domestic grade aluminum alloy. Precision wheel and hub centric fit.