Clamp mount bung mixer has 5:1 ratio helical gearbox provides plenty of torque for tough jobs. They have high viscosity materials like heavy paints, resins and polymers, and re-suspends settled materials for mixes. The mixers clam to rim of closed or open drums, which include stainless steel folding propellers that fit through bung openings of closed drums. It has totally-enclosed, fan-cooled, explosion-proof and air motors and they are standard one. The TEFC models come with cord, switch and three-prong plug. The electric variable-speed models come with speed controller mounted directly on and pre-wired to motor.