Blast away debris from your bearings with the RPM Bearing Blaster! This is a simple two-piece design to simplify difficult bearing cleaning tasks. The RPM Bearing Blaster has an open, flow through design that eliminates back-pressure, 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 being cleaned and makes cleaning bearings much quicker. By using hand pressure, you will know for sure the cleaning agent is passing through the bearings and not bypassing them. 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.). Standing at a mere 1-1/8" tall and 1-3/4" in diameter.