This is a 2" x 5/16" magnetic stir bar used with stir plates.
(These are not recommended with our StirStarter plate, they are too long to spin centered on the stir plate)
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Based on 2 reviews
Stir Bar is too big, at least for my plate, at anything over the medium setting it throws the bar, and it's a pain to recenter it because of its size. AIH note: The 2" stir bar is not recommended with our StirStarter plate, they are too long to spin centered on the stir plate.
Works great, would suggest this item. I have a flat one this size with out the middle ring and it does not work as good as this one.