Roll N Lock truck bed covers offers a variety of styles of retractable tonneau covers. They offer electric and non electric covers to cover all of your needs. From its retractable function, which permits opening or closing in literally seconds, to its rigid, vinyl-over-aluminum laminated construction, the Roll-N-Lock M-Series hybrid 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.