✫Compatible with: 2004-2019 F150 2WD will raise the rear 3", 2004-2008 f150 4WD will raise 1", 2009-2019 F150 4WD will raise the rear 1.5" | ✫NOTE: 12.9 grades the leaf springs U bolts is Longer than original bolts and the thread pitch is 9/16-18, which is more suitable for the higher block on the tuner. | ✫ BENEFITS: (I) CNC automatic processing ensure high accuracy and stability(0.02mm) (II)6061-T6 aluminum forged alloymaterial. (III)High quality pre-installed heat treated 12.9 grade studs.(IV)The Cross Gusset Plate Locked design of the rear lift block, ensuring stronger support than others. | ✫ Easy Install: Installation can be completed within 1-2 hours and does not require strut/coil disassembly like other kits. | ✫ PRODUCT WARRANTY:All Richeer products are covered by the Richeer two (1) year warranty to be free of defects in material and workmanship for two years from date purchased. If you have any questions or you are not satisfied with the product, welcome to contact us.