Proudly North American Established in 1964, Tree Island Steel has grown to become one of North America's largest producers and a global supplier of premium steel wire and wire products. We manufacture a diverse line of wire products from our ISO 9001 certified mills in Canada and the USA. In addition to our North American production, we source high quality goods from all over the world. The combination of production expertise and superior standards enables Tree Island Steel to provide customized solutions to meet any and all customer needs. Tree Island Steel operates five production mills and three warehouses in North America.