Quick Clamp for Easy Installation The rails and headers can be simply clamped on with no drilling or special tools required. After installation, they can only be accessed from the inside by opening the tailgate. Lock your tailgate to lock bed cover. Heavy Duty Crossbar The Good Quality, pre-assembled aluminum frame and crossbars feature easy installation and operation. They support the surface by exerting horizontal tension to provide maximum security and durability. Specification: Condition: New Material: double aluminum panel and honeycomb aluminum Type: Hard Tri-Fold Fitment? For Chevy Colorado 2004-2014,For GMC Canyon 2004-2014 Package?1 Tonneau Cover