The Tonno Pro Hard Fold has been designed with an extremely tough all aluminum underbody frame covered with our highest marine grade vinyl on top. This impact resistant cover offers maximum security with the ease of installation and operation. To open, simply unclamp the EZ lock handles and fold the cover forward. The nylon straps hold the cover in the open position when you need to haul your cargo. This cover comes completely assembled - NO DRILLING is required! Installation time is less than 10 minutes.\nTonno Pro Hard Fold Tri-Folding Truck Bed Cover\n2019-2021 Chevrolet Silverado 1500 79.4 Bed Without Factory Side Storage Boxes; 2019-2021 Chevrolet Silverado 1500 79.4 Bed Without Factory Side Storage Boxes; 2019-2021 GMC Sierra 1500 79.4 Bed Without Factory Side Storage Boxes; 2019-2021 GMC Sierra 1500 79.4 Bed Without Factory Side Storage Boxes