Fulterer''s 5400 series, extra heavy duty, full extension drawer slide will stand up to heavy loads. They feature a 450 lb. load rating, are non-handed and precision steel ball bearing construction. Available in lengths from 12" to 58" in 2" increments. Use for pullout drawers under stairs, mount in work trucks and RV''s to store heavy tools or generators and any other application that requires an extra heavy duty full extension pullout. Note: The slide must be fixed to the cabinet by screw fasteners in every available hole. One set comes with a left and right slide to do one drawer.