The MI name reflects the company’s roots. MI began as a window-screening business that was named “Metal Industries” because of the metal screen frames it produced. Over time, the company’s name was shortened to MI as its primary business shifted to other building materials, primarily vinyl windows and patio doors. The company is no longer registered as “Metal Industries,” and is solely focused on window and door manufacturing. However, in recognition of its 75-year history, the company has maintained the MI name.