2x Front Billet Lift SpacersBillet Aluminum for superior strengthHeat Treated for nearly 3 times the strength of other Aluminum AlloysRigorously tested off road to guarantee safetyPrecision CNC milled for a perfect fitInstallation instructionsIMPORTANT:FX4 MODELS WILL NOT FIT 3" OR 3.5"Please check out our installation video:Our Pro-Billet series strut spacer Ford F150 lift kit is precision engineered from 6061-T6 aircraft aluminum, then anodized for a superior finish. Billet aluminum is a great material for use in suspension applications as it has an immensely high strength to weight ratio along with a superior level of corrosion resistance compared to many other metals on the market. Unlike steel kits that are cut-out and welded together, our Pro-Billet kits are machined from a solid piece and will not bend or warp under even the most stressful conditions.NOTES: An alignment is always recommended after altering the height of your vehicle.*Will not fit 2004 Heritage Models