Housing with tendon are made of cast iron to get high strenth and fine heat loss. Gears is made of forge steel, finished with gas carburising process and precise grounting to get high precise, high efficiency Carburized gears are durable and highly accurate. Flange-mounted with hollow shaft, foot-mounted with hollow shaft, and can be added torque arm and other special accessories. Large strength, long-term usage Large output torque, smooth startup, high efficiency. Input power 0.12-200kw Ratio 3.77-22323 Output torque up to 18000n.M. Wood, carton.