To protect your cargo against theft and the weather from the outside, you need a roll cover you can trust. Roll-N-Lock is the world's most versatile and secure pickup roll cover. With its rigid, extruded aluminum construction, the Roll-N-Lock tonneau cover offers everything that other tonneau covers cannot. No space between the slats that cause the skewing, no roll or bundle that can jam, no problems with crossbeams, no shrinkage of the material due to temperature differences, no rubbers with hinged slats, and - most important of all - no worries about the safety of your cargo. Roll - N -Lock retractable pickup roll covers - by far, the most advanced tonneau ever made.