process of making super-large hex nuts and bolts. Korean metal factory

process of making super-large hex nuts and bolts. Korean metal factory Company homepage and sales site: https://www.google.co.kr/maps/place/(%EC%A3%BC)%EC%A0%9C%EC%9D%B4%EC%97%90%EC%9D%B4%EC%B9%98%ED%85%8C%ED%81%AC/data=!4m5!3m4!1s0x3568c21833ff17e1:0xed632587efc74024!8m2!3d35.1341833!4d128.9691047?hl=ko&entry=yt