AFCO's Eliminator Double Adjustable Drag Shock gives you the widest adjustment range in the industry. Compression and Rebound adjust independently from each other. This 3" stroke shock comes with coil-over hardware. 10" comp x 12.9" Ext length= best for 10.75"-11.25" centers at ride height. Valve range covers 1,000 hp or less applications (for higher hp check out our "Big Gun" series.) Recommended 7" spring sold separately.