Custom-made for the ProMaster wheel size, this lock is a combination of a Gorilla nut and key with a 4130 Steel, CNC turned and nickel plated, threaded stud. (Converts a M14 nut to a M16 stud). This lock provides extra security for your stock or aftermarket spare wheel. Spinning collar and recessed key makes this a challenge to try to remove. Sold as singles and not recommended for driving wheel locations, spare only.