For deep groove ball bearings, which are utilized in high speed applications, GRW has developed the feature Q21speed® - a new retaining cage design. This reaches a significant increase in performance regarding running friction and dynamic behavior. In addition, our patented ball-bag-design guarantees a lifespan increase and it runs very quietly. With this innovative Q21-feature, we can equip both snap cages in radial deep groove ball bearings and window cages in angular contact ball bearings.