Arospeed? Racing Aluminium Wheel Nut means longer wheel life, reduced maintenance and greater safety. The nut body on each Arospeed? Racing Aluminium Wheel Nut is made of through-hardened Aluminium This design generates a bearing-type action which allows more of the torque to be transmitted into clamping force. At the same time, this bearing action offers a more precise torque-to-clamp force relationship, allowing the entire fastening system to be used at the optimum end of the load range.