The process of making the largest hexagonal nut on Earth. Korean metal factory
Company homepage and sales site: https://map.naver.com/v5/search/%EB%B6%80%EC%82%B0%20%ED%98%84%EB%8C%80%EA%B8%88%EC%86%8D/place/1953841124?placePath=%3Fentry=pll%26from=nx%26fromNxList=true&c=15,0,0,0,dh