INNO Roof Rack Stays with Lock and Keys for Vehicles with Smooth Rooftop (Pack of 4) 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)