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He combination of worm and worm is that only the worm can move. No other brake stop device is needed, and the operation is very stable. Increase mechanical power and obtain higher horsepower We are a registered manufaturer in China, Professional in the Gear, Gear rack, synchronization pulley, Turbine and Worm, the main material are Aluminum, brass,stainess steel and carbon steel. Good quality and long using life. Welcom for inquiries.