These roof rails should not be used for hauling any cargo as the construction is very poor. One of the eight rivet nuts installed into the side of the roof rails pulled out when I tried to install my cross-bars. Also, the silver plastic covers won't stay on completely because the push clips installed in them are very thin and weak and will not stay in the black plastic bases. Mine keep popping off at the ends, creating a huge gap, which looks bad. Also, the included rubber seals are too thin and soft to stay in place during installation, they keep slipping under the black plastic base, which looks bad. Also, some of the metal nuts used to hold the black plastic bases to the vehicle roof studs require a star socket, which is not included. Two allen keys are included, but only one can be used. The other one does not fit anything. Also, I am a very experienced mechanic and have installed roof rails and cross bars on other vehicles in the past.