6903 bearing guide. SOLD AS ONE SINGLE UNIT--2 ARE PICTURED TO SHOW BOTH SIDES. For pressing 6903/61903 bearings into wheel hubs, etc., where the axle is installed BEFORE the bearing. The "cup" design allows for the bearing to be pressed in OVER the axle. For use with Enduro Hub Press Tool or any other press using 8mm OD threaded rod.