Milwaukee® 9 mm X 26 mm X 8 mm Ball Bearing is designed for grinders, sanders, single speed hole hawg drills, two speed hole hawg drills, drill press, polishers, 7" heavy-duty polishers, 7" disc sander, electric drills/drivers, 1/2"/3/4"/5/8"/7/8" electric drills, diamond core drills, super hole shooters, variable speed super hole shooters, 7" & 9"polisher and 3" & 5" straight grinders.