ZHEJIANG GOLDHELMET INDUSTRY&TRADE CO., LTD is a developer, producer and trader for locks, security doors and steel interior doors all in one. The company is established on 2005, and we're located at the capital of hardware - YONGKANG. We're awarded for our peephole, cylinder and door frame patents in our country. Our products are all tested and certified by the ministry of public security of China. Right now, we had successfully developed the Mega-B cylinder, and made it a nationally wide ...