This is the foot you need for vehicles with no factory rack or roof rack attachment points. Installs quickly and easily and the torque limiter key indicates when the rack is safely and properly secured to the vehicle. The key stores inside the clamp. The clamps fit Thule WingBar Evo, AeroBlade, SquareBar and ProBar. They are lockable with Thule One-Key locks (sold separately). Maximum load is 75kg but make sure to check the roof load capacity of your vehicle. Sold in 4-packs.