AFCO's Reactor Series Single Adjustable Drag Shock is an economical alternative to a fully adjustable design. Monotube design that features a wide range of rebound adjustability without bleeding over into compression changes. This 8" shock comes with coil-over hardware. 16.22 comp x 24.17 ext. length= best for 18-21" centers at ride height. Valve range covers 1,000 hp or less applications (for higher hp check out our "Big Gun" series.) Recommended 14" spring sold separately.