Brand new, only opened box and realized already have this exact kit installed. Max Lift 2.25" - Max Tire Diameter 33" Will work on 2015-18 Silverado/Sierra 1500 Best quality, best design for the proper leveling lift on new body style GM 1500 trucks CNC machined aircraft 6061-T6 billet construction Not for use with vehicles equipped with factory Air-Ride. Vehicles equipped with Magnetic Ride Control will require re-calibration. NOTE: Check factory height prior to ordering or installing. Trucks with more than 22'' of 'wheel hub to fender lip' height may require less lift. 1/2" front wheel spacers may be required to run a 285 or larger tire on factory wheels.