Application : 2004-2016 Ford F-150 2WD/4WD Description: The thickness is About 42 mm,but it can lift 2.5 inch Rear Block is 2'' thickness 2004-2020 Ford F-150 2WD has NO stock block, it will provide additional 2" lift 2004-2008 Ford F-150 4WD has 2" stock block, it will provide NO additional lift; 2009-2020 Ford F-150 4WD has 1.5" stock block, it will provide additional 0.5" lift; These blocks replace the stock rear blocks .