Telescopic adjustment knobs make the Inno INSU a cinch to install on your car, minivan or pickup-truck rooftop. * Includes 4 pack of Inno locks and keys to lock the car rack to rooftop. * No tools required for assembly * Protective surfaces on Inno Stays prevent shifting and protect vehicle"s paint finish. * Short roof lined cars, minivans & pickup trucks including 2-door models and vehicles with dramatically curved rooftops may requires the additional Inno IN-JK Joint Bars short roof line adapter kit (sold separately)