MaxMate Low Profile Roll Up Truck Bed Tonneau Cover Works with 1999-2007 Ford F-250 F-350 F-450 Super Duty | Styleside 8' Bed US Design Patented Comes with dual coated 24oz marine grade vinyl top, heavy duty aluminum powder coated side rails and clamps. Built-in horizontal crossbars offer support when cover is lying flat and roll up with the cover providing full bed access. Seals with Velcro strip on the sides and secures with latch lock system at the tailgate. Also comes with adjustable tension system on the end of the side rails to keep the cover tight and wrinkle free. 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.)