From the Super Mario Wiki, the Mario encyclopedia
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Big Grinders are larger versions of Grinders that only appear in New Super Mario Bros. 2. They act the same as normal Grinders. They only appear in World 3- and the third level of the Impossible Pack, and like normal Grinders, they can only be defeated with an Invincibility Leaf and a Super Star. They tend to come from the ceiling or from underwater and chase the player for a while before retreating.