Here is a typical takedown tool looking at it from the underside... it was the first photo I could locate...
If you do a search in the ACCESSORIES forum for takedown tool, you will likely find other photos from different angles.
This tool is used to remove the grip screws and the hole in the tool was slipped over the magazine follower button so that more leverage could be applied by your thumb to make magazine loading an easier task...
the tool is shown slightly larger than actual size...