· At Tri-State Aluminum, we offer aluminum tee extrusions in a range of 6000 series aluminum alloys, including 6005/6005A, 6061, and 6063. Our aluminum tee extrusions are highly resistant to corrosion and can be cut to length, meaning they can be used in wide range of industrial applications. In addition, Tri-State Aluminum can also provide anodized and painted finishes if required. Contact us to order today!