Roll-N-Lock 2020 GM Silverado / Sierra 2500/3500 6ft 10in Bed A-Series Retractable Tonneau CoverThe all aluminum A Series retractable tonneau cover is built with rugged durability to stand the test of time. 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 provide only out of sight, out of mind security, Roll N Lock's A Series is the real deal. With no exposed rubber seams and a patented tailgate