2 ball bearing installed aluminum 5152 cog wheel for ABU. It replaces 5152 cogs. Matches with 19373 white spool gear for UltraCast spools of 4500C-6600C. Doesn't fit to the reel with 23404 cog, or 4600UC, 5600UC and 6600UC with 23293 cog. If your reel has 23404 cog, please replace 23403 spool cog by 19373 spool cog and this metal gear matches. Bearings are rated at ABEC7. How to change cogs.