Agri-Cover Access Tool Box Edition Tonneau Cover is designed to protect the truck bed from water, snow and dust. The simple twist-dial release system makes it a breeze to roll up the cover and the dual side latching automatically locks and unlocks when the cover is opened or closed. The cover features handy tension adjuster that fine-tunes the cover tension conveniently with the turn of a dial. Guarantees easy installation and is backed up with a limited lifetime warranty.