Roll N Lock A-Series XT Locking Retractable Truck Bed Cover for 19 (New Body Style)-24 Chevy Silverado/GMC Sierra 1500 6' 7" Bed w/o CarbonPro Bed Model 224A-XTRoll N Lock A Series XT Locking Retractable Truck Bed Cover for 19 (New Body Style) 24 Chevy Silverado GMC Sierra 1500 6' 7" Bed w o CarbonPro Bed Model 224A XT The Roll N Lock A SERIES XT combines the all aluminum A Series retractable truck bed cover with our T slot integrated MaxTrak System that allows for unique customization to your truck bed to meet your individual needs. The Roll N Lock A XT provides you effortless full bed convenience while not