What are the more famous companies that make molds?

The well-known mold-making areas in China should be Zhejiang, Jiangsu and Guangdong. I know more about the molds here in Zhejiang. Saihao, Cologne Plastic Mould and Dow are all famous, but their fields are different, so it is not necessary to say who is the best and who is not. Some of them specialize in making automobile molds, and some specialize in making daily necessities molds. The contrast between them is not great. In terms of technical difficulty, it should be the difficulty of automobile mold. hope this helps