I'll bet there made for the neuroed studs. Usually when they use a screw in stud the threads that screw into the hub are larger then the stud threads and are left handed threads otherwise when you tighten the nylock nuts the bolts would loosen. When the hubs use neuroed studs the hole will be 12.5 -13mm for a 12mm thread when the bolt is pressed in the stud usually a grade 8 or 10 is harder then the cast which allow's the neurod stud to cut into the hub creating a grip so that the stud will not spin in the hub when tightening.
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