I ordered 3 different sizes, 4", 6" and 9". 2 of them have malfunction screwing mechanism, where the hook would get stuck before it can be tightened on the car. CleanRun is excellent and took care of them. Also the length of the loop part is different on the different bar size. For some reason the 6" lock has the longest loop. This is the only one that is able to fit my rear car door (as shown on one of the picture in description). Both the 4" and 9" lock have a short loop that cannot reach the door lock. You can see the different loop sizes in the description picture of them lined up (it is not just perspective) The only one that works does work perfectly with my vehicle.