Traverse Allen Torque Key
Buy Now: Traverse Foot Pack - Thule 480 roof rack bases
Thule includes an allen wrench (key) that is also indicates when the feet are properly tightened. As the torque on the key increases the gray part of the handle rotates to the right with respect to the green inner part. When the line in the gray handle body aligns up with the center of the center green part the rack is correctly tightened.