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 *