The Roll-N-Lock M-SERIES XT combines the M-Series retractable truck bed cover with our T-slot integrated MaxTrak System that allows for unique customization to your truck bed to meet your individual needs. The Roll-N-Lock M-XT is a secure, robust vinyl-over-aluminum hybrid cover design dedicated to delivering four-season protection and optimal bed security. It tackles durability while remaining exceptionally easy to operate with its unique frictionless construction and insulated grip handle. Simply use its key to unlock the cover and begin to open towards the cab as it retracts into its compact canister. The M-XT can open, close, and lock without ever opening the truckA?A*A*s tailgate, and with multiple latching positions, it provides unmatched convenience with quick access to your bed and gear. M-Series XT Locking Retractable Truck Bed Cover for 2014-2018 (2019 Legacy/Limited) Chevy Silverado/GMC Sierra 1500/2015-2019 2500 HD/3500 HD 6' 7" Bed M-Series XT Tonneau Cover 2018 Chevrolet Silverado 1500 78.8 Bed, 2014-2017 Chevrolet Silverado 1500 78.9 Bed, 2019 Chevrolet Silverado 1500 LD 78.8 Bed, 2015-2019 Chevrolet Silverado 2500 HD 78.8 Bed, 2015-2019 Chevrolet Silverado 3500 HD 78.8 Bed, 2018 GMC Sierra 1500 78.8 Bed, 2014-2017 GMC Sierra 1500 78.9 Bed, 2019 GMC Sierra 1500 Limited 78.8 Bed, 2015-2019 GMC Sierra 2500 HD 78.8 Bed, 2015-2019 GMC Sierra 3500 HD 78.8 Bed