This kit is for repairing damaged wheel stud threads back to a usable state. By using a reverse action to ensure the alignment of the thread, the tools in this kit ensure wheel stud threads are brought back to a near-new state, saving the time and money you would use on replacing the stud itself. Three adaptor sizes are included: M12 x 1.25mm, M12 x 1.5mm and M14 x 1.5mm.