"Interstate 80 California" Sign by SmartSign | 12" x 12" Aluminum Heavy, 80 mil thick, rust-proof recycled aluminum Uses durable, 3M inks designed for outdoor traffic and property signs. Outlasts other sign printing. Laminate protects against abrasions, graffiti, chemicals, and weather Resists chemicals, UV rays, water, and abrasions Mounting holes allow for hassle-free installation 12"x12" has two 3/8" holes, 1.5" from the top and bottom. 9" apart, from center to center, with a 1.5" corner radius