608 bearing guide set. SOLD AS ONE SINGLE UNIT--2 ARE PICTURED TO SHOW BOTH SIDES. For pressing number 608 bearings into wheel hubs, etc., where the axle is installed after the bearing. For use with Enduro Hub Press Tool or any other press using 8mm OD threaded rod. NOTE: The ID of a 608 bearing is 8mm, so the threaded rod takes the place of the usual bearing "nub" on the guides.