Zhejiang Shuanghuan Driveline Co., Ltd., along with its subsidiaries, designs, researches, develops, and manufactures mechanical transmission gears and related parts in China and internationally. Its products include transmission core components for passenger vehicles such as MT, AMT, DCT, CVT, AT, transfer case gears, synchronizers, electronic vehicle products, gear shafts, differential mechanisms, hybrid electric vehicle products, DHT, engine-gear rings, and planetary and scissor gears. The company also supplies transmission case gear shafts and engine gears for commercial vehicles, off-road construction machinery gears, small spiral bevel gear power tools, rail transit gears, pinion shafts for wind power, and motorcycle engine gears including terrain vehicle gears and Haomai 50 gears. Additionally, it is involved in research and test experience development, software and information technology services, technology promotion and application services, and investment business. Founded in 1980, the company is headquartered in Hangzhou, China.