These tie down hooks can be added to the AeroBox™ to provide additional tie-down security points across the truck bed for long items hauled in the pick-up bed, such as ladders, lumber, pipes, etc. The attachment points are located on either side of 2 bicycle tire slots on the front side of the AeroBox™. So the AeroBox™ not only provides a great place to stow your biking gear, but helps secure your bikes as well. The set includes (3) tie downs and all required hardware to attach them to the AeroBox™.