Zhongwang. According to the inquiry on Weidun's official website, it can be seen that the glass used in Weidun's doors and windows is the Zhongwang brand. Weidun Doors and Windows is a brand registered by Beijing Weidun Doors and Windows Co., Ltd. with the Trademark Office. The main goods and services include steel pipes, metal belt hinges, metal screws, small hardware, metal locks (non-electrical), unprocessed or semi-processed ordinary metals, construction metal accessories, metal windows, metal door handles, and door metal accessories.