MaxMate Tri-Fold Truck Bed Tonneau Cover works with 2007-2013 Chevy Silverado/GMC Sierra 1500; 2007-2014 Silverado/Sierra 2500 3500 HD | Excl. 2007 Classic | Fleetside 6.5 Bed US Design Patented Made of dual coated 24oz marine grade vinyl, heavy duty aluminum powder coated frames, and comes with stainless steel clamps for easy installation and great durability. Pre-assembled horizontal crossbars offer support and conveniently fold up with the cover providing full bed access. Easy No-Drilling installation with the provided instruction and hardware. (Small holes will need to be cut for vehicle equipped with Over-the-Bedrail bedliner to secure the clamps; Works with Under-the-Bedrail bedliner without modification.) No-Hassle 10 year warranty! (Please measure your truck bed size before ordering. We accept returns; however customer will assume the return shipping cost if ordered wrong.)