As its name implies, the F4 uses extra heavy duty steel tubing and hardware, allowing it to carry up to four bikes. An exclusive dual positioning trunk/bumper system allows a custom fit on all sedans, hatchbacks, sport-utes and minivans. Motorcycle tie down buckles and extra side straps ensure a secure fit for heavy loads. Comes completely preassembled, folds flat for easy storage, and includes day glow safety flag. As its name implies, the F4 uses extra heavy duty steel tubing and hardware carry up to four bikes An exclusive dual positioning trunk/bumper system allows a custom fit Motorcycle tie down buckles and extra side straps ensure a secure fit for heavy loads Comes completely preassembled, folds flat for easy storage, and includes day glow safety flag