This bearing bushing set works very well with 9mm, 10mm, 11mm, & 13mm Diameter Guide Roller Ball Bearings. While the bushing is threaded it self, it generates the screw stronger less susceptible to flex. In addition, because of the improved power, the roller angle are less likely to change even yet in the function of a sizable crash. Also, in the event nut that secures the roller precipitates, the bushing wont quickly come loose. Threaded Bearing Bushing x4 Wrench x1 Thread means roller will continue to be linked a lot longer if its attaching nut does occur in the future down. Right for rollers: things 15344, 15345, 15475.