Roll-N-Lock LG170M Locking Retractable M-Series Truck Bed Tonneau Cover for 2004-2008 F-150 SuperCab & SuperCrew; 2006-2008 Lincoln Mark LT | Fits 5.5' Bed Rigid, vinyl-over-aluminum laminated construction provides security for your cargo; Contoured, patented hinge design provides smooth, frictionless rotation Open and closes in seconds with heavy-duty torsion spring drive housed in a 3" aluminum reel to ensure years of reliable useno snaps and no bulky panels to fold With just a turn of the lock-lever, the Roll-N-Lock tonneau cover slides open. As the cover is pulled back using the convenient built-in pull strap, the patented ratchet-style locking mechanism latches in place at , ,  or fully closed positions Patented clamp-on track design greatly simplifies the installation process while minimizing the need for drilling holes on most trucks; Recessed drain fittings ensure rapid and complete drainage of the reel housing Made in the USA & backed by a 3-Year Limited Warranty