2 ball bearing installed POM engineering plastic 5152 cog wheel kit for ABU. Comes with 19373 spool pinion gear, and you don't have to check fitting. Fits to ABU reels with cogs 5152, 23404, and 21800, meaning almost all ABU Ambassadeur 1500C-6600C5. Please use 19373 white gear for UltraCast spools of 4500C-6600C. Doesn't fit to 4600UC, 5600UC or 6600UC with 23293 cog. Bearings are rated at ABEC7. How to change cogs.