The Royal Wire Main Frame System is our crown jewel and the backbone of our organizational system. A stronger main-frame cannot be found. The Four-Tiered Main Frame is constructed out of carbon steel wire and then is zinc plated to guard against rust and corrosion. The Main Frame can be permanently mounted to a wall or hung with the two 15” single wire hooks provided. Functional, durable and easily assembled, this main frame system is great any where you put it.