Extang Revolution Roll-up Truck Bed Tonneau Cover | 54650 | fits Chevy/GMC Silverado/Sierra (6 1/2 ft) 07-13, 2014-2500HD & 3500HD, works with/without track system An Incredible Roll Up Tonneau Cover With A Revolutionary Design Automatic Tension Design For Quick Latch And Go Operation Provides A Stylish Near Flush Fit Side Rails Are Pre-Drilled for Quick and Easy Clamp Placement Automoatic Tension System Keeps Tarp Tight And Looking Great