INNO Roof Rack Stays with Lock and Keys for Vehicles with Smooth Rooftops, Pack of 4 (Black) 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,appropriate fit hooks are required and are vehicle specific. Fit only with appropriate K-hooks,kindly refer the fitment guide for compatibility. 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)