The design of the Posi Lock Nut incorporates a threaded inner ring, an outer threaded clamp locking ring, and a snap ring so your axle nut is not susceptible to vibrations or harmonics that would otherwise cause it to work loose. The Posi Lock is used in a similar way as your stock axle nut and requires no modification to your Dura Blue axle. In fact, it has fewer pieces than most stock nuts for simple and more effective usage.