Powerful rare-earth magnets rotated by an air-cooled, direct-drive motor deliver excellent torque and deep vortex, for your toughest large-volume applications. Simple controls allow you to continuously adjust stirring speeds up to 600 rpm (depending on volume and density of liquid). Built-in aluminum support system and durable polypropylene platform are engineered to withstand up to 485 lb (220 kg)- perfect when mixing in a 55-gallon plastic barrel or drum. Polypropylene sides are simple to clean.