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By certification 
Product Description:
Module: 1~10;
Appearance: cylindrical gear;
Material: steel;
Whether standard parts: Non-standard parts;
The driven second gear is a key component of the vehicle transmission, and the engine transmits power to the driven gears of the various gears that mesh with it on the output shaft to achieve the variable speed of the car.
http://www.chinadafagear.com/
