GRW SSF2380 3/32" Ultra High Precision Axle Bearing - OPEN & FLANGED . This bearing is recommended for Cobalt application up through and including Group 7 Open Qualifying. In short – the very most demanding applications that slot cars can dish out. Why GRW? For those who have experienced the GRW performance we’re singing to the choir. For the uninitiated, we can start by saying that the radial play is about a third of many other bearings on the market. Additionally GRW subtly altered the alloying of the 400 series stainless steel to improve the performance of their bearings in a remarkable manner. Not only does it provide the corrosion resistance afforded by stainless steel but the surface finish is improved to provide greater freedom of rotation and better wear resistance for prolonged durability.