Roll-N-Lock 17-19 Ford F-250/F-350 Super Duty SB 80-3/8in A-Series Retractable Tonneau CoverIntroducing the all new, all aluminum A Series retractable tonneau cover. Built with the same rugged durability as the well known M Series, this ground breaking new product includes a long list of innovative design features that only Roll N Lock can provide. The unique, powder coated aluminum cover body of the A Series is bound together by a patent pending hinge technology that delivers a nearly impenetrable seam. Unlike other aluminum bed covers that