RPM BEARING BLASTER MIN ID-1/8 MAX OD-3/4RPM Bearing Blaster! Blast away debris from your bearings and extend bearing life. This simple, two piece tool, works with your favorite cleaning agent, such as Motor Spray, WD-40, electrical contact cleaner, etc. (any cleaner that is pressurized and has a directional spray tube). The RPM Bearing Blaster has an open flow through design that eliminates back-pressure problems which also permits more efficient elimination of dirt and grit from the bearings being cleaned. This tool uses hand pressure to hold the bearing in place during cleaning which means easier access to the bearings and makes cleaning bearings much quicker. By using hand pressure, you will know for sure the cleaning agent is passing through the bearing and not around it. The Bearing Blaster works with all bearings* with a minimum I.D. of 1/8" (3mm.) and a maximum O.D. of 3/4" (19mm.).