The Roll-N-Lock M-SERIES XT combines the M-Series truck bed cover with our T-slot integrated MaxTrak System allowing for unique customization to your truck bed. Pair with your favorite accessories to get twice the storage space and better accessibility for your gear. Mount bikes, coolers, outdoor gear, and more on top of the bed (compatible with most T-slot accessories)! Need more space? This cover has the most compact housing of any retractable cover on the market, only 7 ¼" deep canister. The M-Series XT conveniently has no snaps to manipulate, no roll or bundle to lash down or stow, no crossbars to negotiate, no folding or solid hinged covers to combat, no fabric shrinkage to struggle with, and, best of all, no worries about the security of cargo. Its patented, clamp-on track design makes it easy to install with minimal use of tools. With the turn of the lever and key, the M-Series XT cover slides open with a torsion spring stowed inside a 3" aluminum casing, and paired with the contoured hinge design, gives a smooth, frictionless rotation when opening and closing. The cover can be pulled back with a built-in pull strap for smooth operation. The cover also features a patented, ratchet-style latching mechanism, enabling it to lock in place at four open positions. The M-Series XT's unique vinyl-over-aluminum design combines the ease of a roll-up cover with the strength of a hard folding cover. Want security, we have it with a patented, four-point locking system to lock the cover simultaneously with the tailgate. This retractable cover provides extra security underneath its vinyl top layer by having a patented aluminum undercarriage. The M-Series XT is backed by our US-based customer support team and a 3-year guarantee.