FIRESTONE RIDE-RITE AIR HELPER SPRINGS, SET OF 2 -- Includes air line tubing, inflation valves, air fittings, thermal sleeve, and mounting hardware; Does not include air compressor; 3200-5000 lbs. general Ride-Rite level load rating at 100 psi; 3 in. compressed height; 8.91 in. extended height; 5.5-7 in. ride height; 7.52 in. maximum diameter; Fully adjustable from 20-100 psi; Manual inflation; Provides adjustable suspension settings for better handling and allows for front to rear or side to side leveling; Reduces suspension fatigue and bottoming out; Do not exceed vehicle's gross vehicle weight rating; Drilling necessary.