Hangzhou HeiLei Locks Co., LTD founded in 2005. Our company is a professional manufacturer company including development, design, product and selling. The company was specializing in the production of TIANHU brand alarm lock series. It is the first application in China and has four state patents. In the meantime, our company also produce another locks include high-grade motorcycle lock, E-bike lock, bicycle lock, alarm lock, padlock, door lock, and so on. Our products contain more than 30 ...