helical worm gearmotor made of strong durable metal

helical worm gearmotor are made of strong durable metal like steel and are available in a wide range of sizes and reduction ratios, the ratios of the input speed to the output speed. Other specialized speed reducers include cyclo reducers, inline gear reducers, planetary gearboxes, right angle gear boxes, worm gear reducers, shaft mounted speed reducers and variable speed reducers.