This is the Bearing Blaster from RPM products. This bearing blaster is perfect for preparing 1/8th scale and monster truck clutch bearings for use. Before you use the bearings for the first time, put the bearings into the bearing blaster and blast out all the grease with a can of electric motor cleaner or nitro cleaner. Once the grease has been removed, re-oil the bearings with a single drop of regular machine oil, and you are good to go!
You can also use the bearing blaster to clean dirty bearings when you are maintaining your vehicle.