The?Roll-N-Lock M-Series Retractable Hybrid Tonneau Cover?offers everything other covers do not. There are no snaps to manipulate, there is no roll or bundle to lash down or stow, no crossbars to negotiate, no fabric shrinkage to struggle with, no folding or solid hinged covers to combat, and, best of all, no worries about the security of cargo. The Roll-N-Lock M-Series tonneau cover?by far the most intelligent and versatile tonneau cover made. Great quality originates not only from great materials, but also from forward-thinking design. The M-SERIES? groundbreaking blend of refinement and capability stems from its revolutionary, vinyl-over-aluminum construction. Each slat is rotatively joined by an interlocking hinge. It is the geometry of this uniquely contoured hinge that lends ROLL-N-LOCK its strength, roll compactness and quiet, smooth non-binding movement. Close examination of the ROLL-N-LOCK hinge in the flat position reveals the fact that each slat is inseparably locked together, yet when rotated no metal-to-metal contact occurs.