Directly Bolts in to Factory Holes. (only one small hole needs to be drilled to place air fill valve). Provides up to 5000lbs of Leveling Capacity. Easily add or remove air same as you would a tire. Never exceed more than truck manufacturers maximum load recommendations. Fit For the Following Models. 2001 – 2010 Chevy/GMC 2500/2500HD Trucks with 8 Lug Wheels. Will Not Fit Trucks with Rear Sway Bar. 2 – Standard 2500 lb Air Springs. Mounting Brackets with Hardware. Approved Air Line with Fittings and Schrader Valve. For HK/TW buyers, please notify us your government ID #. For BRA, AR, PER buyers, please leave us your CPF#, CUIT# or RUC# correspondingly. Our guarantee is only for the cost of the item, we will not be responsible for any other expenses such as installation, labor, towing, repair or any other related expenses.