With 4 Bars * Insert adapter in rail receptacle allows for use with 7/8� or 1 diameter rails * Attractive brown vein finish * Constructed of 1 steel for strength and durability * Telescopes with movement of bed * Easily adjusts up or down with spring-loaded release * Spring-loaded crossbars are easy to intall and remove * Universal Cross brace bars can be used with most manufacturers bed rails * Limited Lifetime Warranty * Rails extend from 47� - 78 *