The pivot ring reduces friction against the bottom of the flask, allowing it to spin faster and more efficiently.
Used when propagating yeast on a stir plate. This stir bar can be boiled in the flaskwhen making the started wort.
30 mm size is best in 1000 ml flasks.
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Stir rod works great. I liked the idea of the pivot ring. I thought it would help reduce noise from the chattering on the glass. Unfortunately it didn't help. I couldn't get it to stop chattering no matter what I did. I will say that I made my own stir plate and used this stir rod with that. With that being said though, it is a good product. Works well.