Grindor is a Decepticon from the Transformers: The Movie franchise.
His buzzsaw forms Devastator's arm weapon.
To be added...
Grindor uses his buzzsaw to slice up Autobots.
Grindor (Legends-class toy)
Unlike the Supreme-class Combiner Grindor, this Grindor has a robot mode, a vehicle mode, and a Devastator combiner mode.
Grindor (Voyager-class toy)
This version of Grindor only has a vehicle mode and a robot mode. He Transformers into a Heavy Duty Trencher. His chainsaw in trencher mode actualy spins.
Devastator Combiner Grindor (Combiner Part)
This version only has a vehicle mode and a Devastator combiner mode.