BAKFlip MX4  Hard Folding Truck Bed Tonneau Cover | 448101 | fits 1988-13 GM Silverado, Sierra & C/K 6' 6" bed Durable aluminum panels feature a Matte Finish for advanced scratch and scuff resistance and premium UV-resistance Universal tailgate operation is achieved with our dual action seal that allows you to open or close the cover with the tailgate open or closed When folded up, the MX4 maintains 100% Truck Bed Access, allowing you to haul anything, anytime! Professionally designed for a sleek, low profile appearance and miantians visibility to the third brake light when folded toward the cab MX4 features a No-Drill, Clamp-On Installation and is compatible with BAK's premium storage box, the BAK BOX 2